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Finding the Fourth Proportional to 711,420.48, 981,707.04 and 389,113.92

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Solution

The fourth proportional to 711,420.48, 981,707.04 and 389,113.92 is: 536,948.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,420.48 : 981,707.04 = 389,113.92 : x
  2. Step 2: Convert to fraction form
    711,420.48/981,707.04 = 389,113.92/x
  3. Step 3: Cross multiply
    711,420.48x = 981,707.04 × 389,113.92
  4. Step 4: Simplify right side
    711,420.48x = 381,995,874,626.00
  5. Step 5: Solve for x
    x = 381,995,874,626.00/711,420.48
  6. Step 6: Final answer
    x = 536,948.10

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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.