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Finding the Fourth Proportional to 613,691.40, 920,537.10 and 347,970.90

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Solution

The fourth proportional to 613,691.40, 920,537.10 and 347,970.90 is: 521,956.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,691.40 : 920,537.10 = 347,970.90 : x
  2. Step 2: Convert to fraction form
    613,691.40/920,537.10 = 347,970.90/x
  3. Step 3: Cross multiply
    613,691.40x = 920,537.10 × 347,970.90
  4. Step 4: Simplify right side
    613,691.40x = 320,320,123,170.39
  5. Step 5: Solve for x
    x = 320,320,123,170.39/613,691.40
  6. Step 6: Final answer
    x = 521,956.35

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.