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Finding the Fourth Proportional to 713,818.75, 985,071.30 and 391,531.50

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Solution

The fourth proportional to 713,818.75, 985,071.30 and 391,531.50 is: 540,314.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,818.75 : 985,071.30 = 391,531.50 : x
  2. Step 2: Convert to fraction form
    713,818.75/985,071.30 = 391,531.50/x
  3. Step 3: Cross multiply
    713,818.75x = 985,071.30 × 391,531.50
  4. Step 4: Simplify right side
    713,818.75x = 385,686,443,695.95
  5. Step 5: Solve for x
    x = 385,686,443,695.95/713,818.75
  6. Step 6: Final answer
    x = 540,314.25

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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.