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Finding the Fourth Proportional to 718,220.52, 991,113.95 and 391,526.46

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Solution

The fourth proportional to 718,220.52, 991,113.95 and 391,526.46 is: 540,289.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,220.52 : 991,113.95 = 391,526.46 : x
  2. Step 2: Convert to fraction form
    718,220.52/991,113.95 = 391,526.46/x
  3. Step 3: Cross multiply
    718,220.52x = 991,113.95 × 391,526.46
  4. Step 4: Simplify right side
    718,220.52x = 388,047,336,177.77
  5. Step 5: Solve for x
    x = 388,047,336,177.77/718,220.52
  6. Step 6: Final answer
    x = 540,289.96

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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.