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Finding the Fourth Proportional to 145,415.70, 218,123.55 and 86,433.30

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Solution

The fourth proportional to 145,415.70, 218,123.55 and 86,433.30 is: 129,649.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,415.70 : 218,123.55 = 86,433.30 : x
  2. Step 2: Convert to fraction form
    145,415.70/218,123.55 = 86,433.30/x
  3. Step 3: Cross multiply
    145,415.70x = 218,123.55 × 86,433.30
  4. Step 4: Simplify right side
    145,415.70x = 18,853,138,234.22
  5. Step 5: Solve for x
    x = 18,853,138,234.22/145,415.70
  6. Step 6: Final answer
    x = 129,649.95

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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.