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Finding the Fourth Proportional to 713,978.80, 985,282.32 and 391,691.36

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Solution

The fourth proportional to 713,978.80, 985,282.32 and 391,691.36 is: 540,529.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,978.80 : 985,282.32 = 391,691.36 : x
  2. Step 2: Convert to fraction form
    713,978.80/985,282.32 = 391,691.36/x
  3. Step 3: Cross multiply
    713,978.80x = 985,282.32 × 391,691.36
  4. Step 4: Simplify right side
    713,978.80x = 385,926,571,904.76
  5. Step 5: Solve for x
    x = 385,926,571,904.76/713,978.80
  6. Step 6: Final answer
    x = 540,529.46

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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.