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Finding the Fourth Proportional to 90,630.83, 125,115.99 and 56,658.20

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Solution

The fourth proportional to 90,630.83, 125,115.99 and 56,658.20 is: 78,216.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,630.83 : 125,115.99 = 56,658.20 : x
  2. Step 2: Convert to fraction form
    90,630.83/125,115.99 = 56,658.20/x
  3. Step 3: Cross multiply
    90,630.83x = 125,115.99 × 56,658.20
  4. Step 4: Simplify right side
    90,630.83x = 7,088,846,784.62
  5. Step 5: Solve for x
    x = 7,088,846,784.62/90,630.83
  6. Step 6: Final answer
    x = 78,216.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.