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Finding the Fourth Proportional to 565,512.80, 780,387.85 and 310,862.15

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Solution

The fourth proportional to 565,512.80, 780,387.85 and 310,862.15 is: 428,978.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    565,512.80 : 780,387.85 = 310,862.15 : x
  2. Step 2: Convert to fraction form
    565,512.80/780,387.85 = 310,862.15/x
  3. Step 3: Cross multiply
    565,512.80x = 780,387.85 × 310,862.15
  4. Step 4: Simplify right side
    565,512.80x = 242,593,044,884.88
  5. Step 5: Solve for x
    x = 242,593,044,884.88/565,512.80
  6. Step 6: Final answer
    x = 428,978.88

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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.