Home / 72,129.42-99,539.10-40,299.66

Finding the Fourth Proportional to 72,129.42, 99,539.10 and 40,299.66

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Solution

The fourth proportional to 72,129.42, 99,539.10 and 40,299.66 is: 55,613.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,129.42 : 99,539.10 = 40,299.66 : x
  2. Step 2: Convert to fraction form
    72,129.42/99,539.10 = 40,299.66/x
  3. Step 3: Cross multiply
    72,129.42x = 99,539.10 × 40,299.66
  4. Step 4: Simplify right side
    72,129.42x = 4,011,391,886.71
  5. Step 5: Solve for x
    x = 4,011,391,886.71/72,129.42
  6. Step 6: Final answer
    x = 55,613.81

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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.