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Finding the Fourth Proportional to 713,287.80, 984,330.90 and 390,996.90

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Solution

The fourth proportional to 713,287.80, 984,330.90 and 390,996.90 is: 539,572.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,287.80 : 984,330.90 = 390,996.90 : x
  2. Step 2: Convert to fraction form
    713,287.80/984,330.90 = 390,996.90/x
  3. Step 3: Cross multiply
    713,287.80x = 984,330.90 × 390,996.90
  4. Step 4: Simplify right side
    713,287.80x = 384,870,330,474.21
  5. Step 5: Solve for x
    x = 384,870,330,474.21/713,287.80
  6. Step 6: Final answer
    x = 539,572.29

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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.