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Finding the Fourth Proportional to 709,913.09, 979,719.75 and 387,653.10

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Solution

The fourth proportional to 709,913.09, 979,719.75 and 387,653.10 is: 534,982.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,913.09 : 979,719.75 = 387,653.10 : x
  2. Step 2: Convert to fraction form
    709,913.09/979,719.75 = 387,653.10/x
  3. Step 3: Cross multiply
    709,913.09x = 979,719.75 × 387,653.10
  4. Step 4: Simplify right side
    709,913.09x = 379,791,398,218.73
  5. Step 5: Solve for x
    x = 379,791,398,218.73/709,913.09
  6. Step 6: Final answer
    x = 534,982.95

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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.