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Finding the Fourth Proportional to 1,000.64, 1,380.96 and 607.64

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Solution

The fourth proportional to 1,000.64, 1,380.96 and 607.64 is: 838.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.64 : 1,380.96 = 607.64 : x
  2. Step 2: Convert to fraction form
    1,000.64/1,380.96 = 607.64/x
  3. Step 3: Cross multiply
    1,000.64x = 1,380.96 × 607.64
  4. Step 4: Simplify right side
    1,000.64x = 839,126.53
  5. Step 5: Solve for x
    x = 839,126.53/1,000.64
  6. Step 6: Final answer
    x = 838.59

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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.