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Finding the Fourth Proportional to 660,855, 912,057.66 and 392,583

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Solution

The fourth proportional to 660,855, 912,057.66 and 392,583 is: 541,810.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,855 : 912,057.66 = 392,583 : x
  2. Step 2: Convert to fraction form
    660,855/912,057.66 = 392,583/x
  3. Step 3: Cross multiply
    660,855x = 912,057.66 × 392,583
  4. Step 4: Simplify right side
    660,855x = 358,058,332,335.78
  5. Step 5: Solve for x
    x = 358,058,332,335.78/660,855
  6. Step 6: Final answer
    x = 541,810.73

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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.