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Finding the Fourth Proportional to 710,986.86, 981,165.33 and 388,696.95

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Solution

The fourth proportional to 710,986.86, 981,165.33 and 388,696.95 is: 536,403.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,986.86 : 981,165.33 = 388,696.95 : x
  2. Step 2: Convert to fraction form
    710,986.86/981,165.33 = 388,696.95/x
  3. Step 3: Cross multiply
    710,986.86x = 981,165.33 × 388,696.95
  4. Step 4: Simplify right side
    710,986.86x = 381,375,971,216.74
  5. Step 5: Solve for x
    x = 381,375,971,216.74/710,986.86
  6. Step 6: Final answer
    x = 536,403.68

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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.