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Finding the Fourth Proportional to 286,279.20, 429,418.80 and 86,630.40

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Solution

The fourth proportional to 286,279.20, 429,418.80 and 86,630.40 is: 129,945.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,279.20 : 429,418.80 = 86,630.40 : x
  2. Step 2: Convert to fraction form
    286,279.20/429,418.80 = 86,630.40/x
  3. Step 3: Cross multiply
    286,279.20x = 429,418.80 × 86,630.40
  4. Step 4: Simplify right side
    286,279.20x = 37,200,722,411.52
  5. Step 5: Solve for x
    x = 37,200,722,411.52/286,279.20
  6. Step 6: Final answer
    x = 129,945.60

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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.