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Finding the Fourth Proportional to 87,455.60, 131,215.80 and 84,215.60

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Solution

The fourth proportional to 87,455.60, 131,215.80 and 84,215.60 is: 126,354.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,455.60 : 131,215.80 = 84,215.60 : x
  2. Step 2: Convert to fraction form
    87,455.60/131,215.80 = 84,215.60/x
  3. Step 3: Cross multiply
    87,455.60x = 131,215.80 × 84,215.60
  4. Step 4: Simplify right side
    87,455.60x = 11,050,417,326.48
  5. Step 5: Solve for x
    x = 11,050,417,326.48/87,455.60
  6. Step 6: Final answer
    x = 126,354.60

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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.