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Finding the Fourth Proportional to 711,339.72, 981,612.42 and 388,987.16

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Solution

The fourth proportional to 711,339.72, 981,612.42 and 388,987.16 is: 536,782.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,339.72 : 981,612.42 = 388,987.16 : x
  2. Step 2: Convert to fraction form
    711,339.72/981,612.42 = 388,987.16/x
  3. Step 3: Cross multiply
    711,339.72x = 981,612.42 × 388,987.16
  4. Step 4: Simplify right side
    711,339.72x = 381,834,627,476.53
  5. Step 5: Solve for x
    x = 381,834,627,476.53/711,339.72
  6. Step 6: Final answer
    x = 536,782.38

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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.