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Finding the Fourth Proportional to 545,909.60, 818,864.40 and 387,279.20

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Solution

The fourth proportional to 545,909.60, 818,864.40 and 387,279.20 is: 580,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,909.60 : 818,864.40 = 387,279.20 : x
  2. Step 2: Convert to fraction form
    545,909.60/818,864.40 = 387,279.20/x
  3. Step 3: Cross multiply
    545,909.60x = 818,864.40 × 387,279.20
  4. Step 4: Simplify right side
    545,909.60x = 317,129,149,740.48
  5. Step 5: Solve for x
    x = 317,129,149,740.48/545,909.60
  6. Step 6: Final answer
    x = 580,918.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.