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Finding the Fourth Proportional to 256,934.80, 385,387.80 and 79,440.40

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Solution

The fourth proportional to 256,934.80, 385,387.80 and 79,440.40 is: 119,156.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,934.80 : 385,387.80 = 79,440.40 : x
  2. Step 2: Convert to fraction form
    256,934.80/385,387.80 = 79,440.40/x
  3. Step 3: Cross multiply
    256,934.80x = 385,387.80 × 79,440.40
  4. Step 4: Simplify right side
    256,934.80x = 30,615,360,987.12
  5. Step 5: Solve for x
    x = 30,615,360,987.12/256,934.80
  6. Step 6: Final answer
    x = 119,156.15

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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.