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Finding the Fourth Proportional to 836.40, 1,153.76 and 556.76

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Solution

The fourth proportional to 836.40, 1,153.76 and 556.76 is: 768.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.40 : 1,153.76 = 556.76 : x
  2. Step 2: Convert to fraction form
    836.40/1,153.76 = 556.76/x
  3. Step 3: Cross multiply
    836.40x = 1,153.76 × 556.76
  4. Step 4: Simplify right side
    836.40x = 642,367.42
  5. Step 5: Solve for x
    x = 642,367.42/836.40
  6. Step 6: Final answer
    x = 768.01

Related Problems

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Half scale
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Double scale
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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.