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Finding the Fourth Proportional to 710,989.74, 981,169.30 and 388,699.86

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Solution

The fourth proportional to 710,989.74, 981,169.30 and 388,699.86 is: 536,407.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,989.74 : 981,169.30 = 388,699.86 : x
  2. Step 2: Convert to fraction form
    710,989.74/981,169.30 = 388,699.86/x
  3. Step 3: Cross multiply
    710,989.74x = 981,169.30 × 388,699.86
  4. Step 4: Simplify right side
    710,989.74x = 381,380,369,546.30
  5. Step 5: Solve for x
    x = 381,380,369,546.30/710,989.74
  6. Step 6: Final answer
    x = 536,407.70

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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.