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Finding the Fourth Proportional to 713,405.68, 984,499.58 and 391,108.86

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Solution

The fourth proportional to 713,405.68, 984,499.58 and 391,108.86 is: 539,730.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,405.68 : 984,499.58 = 391,108.86 : x
  2. Step 2: Convert to fraction form
    713,405.68/984,499.58 = 391,108.86/x
  3. Step 3: Cross multiply
    713,405.68x = 984,499.58 × 391,108.86
  4. Step 4: Simplify right side
    713,405.68x = 385,046,509,382.05
  5. Step 5: Solve for x
    x = 385,046,509,382.05/713,405.68
  6. Step 6: Final answer
    x = 539,730.09

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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.