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Finding the Fourth Proportional to 709,666.80, 979,304.76 and 387,390.48

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Solution

The fourth proportional to 709,666.80, 979,304.76 and 387,390.48 is: 534,579.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,666.80 : 979,304.76 = 387,390.48 : x
  2. Step 2: Convert to fraction form
    709,666.80/979,304.76 = 387,390.48/x
  3. Step 3: Cross multiply
    709,666.80x = 979,304.76 × 387,390.48
  4. Step 4: Simplify right side
    709,666.80x = 379,373,341,042.69
  5. Step 5: Solve for x
    x = 379,373,341,042.69/709,666.80
  6. Step 6: Final answer
    x = 534,579.53

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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.