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Finding the Fourth Proportional to 1,000.40, 1,380.80 and 607.76

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Solution

The fourth proportional to 1,000.40, 1,380.80 and 607.76 is: 838.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.40 : 1,380.80 = 607.76 : x
  2. Step 2: Convert to fraction form
    1,000.40/1,380.80 = 607.76/x
  3. Step 3: Cross multiply
    1,000.40x = 1,380.80 × 607.76
  4. Step 4: Simplify right side
    1,000.40x = 839,189.62
  5. Step 5: Solve for x
    x = 839,189.62/1,000.40
  6. Step 6: Final answer
    x = 838.85

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.