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Finding the Fourth Proportional to 718,306.32, 991,307.40 and 396,015.93

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Solution

The fourth proportional to 718,306.32, 991,307.40 and 396,015.93 is: 546,526.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,306.32 : 991,307.40 = 396,015.93 : x
  2. Step 2: Convert to fraction form
    718,306.32/991,307.40 = 396,015.93/x
  3. Step 3: Cross multiply
    718,306.32x = 991,307.40 × 396,015.93
  4. Step 4: Simplify right side
    718,306.32x = 392,573,521,926.88
  5. Step 5: Solve for x
    x = 392,573,521,926.88/718,306.32
  6. Step 6: Final answer
    x = 546,526.62

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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.