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Finding the Fourth Proportional to 165,142.80, 247,714.20 and 86,281.20

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Solution

The fourth proportional to 165,142.80, 247,714.20 and 86,281.20 is: 129,421.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,142.80 : 247,714.20 = 86,281.20 : x
  2. Step 2: Convert to fraction form
    165,142.80/247,714.20 = 86,281.20/x
  3. Step 3: Cross multiply
    165,142.80x = 247,714.20 × 86,281.20
  4. Step 4: Simplify right side
    165,142.80x = 21,373,078,433.04
  5. Step 5: Solve for x
    x = 21,373,078,433.04/165,142.80
  6. Step 6: Final answer
    x = 129,421.80

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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.