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Finding the Fourth Proportional to 72,221.78, 99,666.74 and 40,390.74

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Solution

The fourth proportional to 72,221.78, 99,666.74 and 40,390.74 is: 55,739.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,221.78 : 99,666.74 = 40,390.74 : x
  2. Step 2: Convert to fraction form
    72,221.78/99,666.74 = 40,390.74/x
  3. Step 3: Cross multiply
    72,221.78x = 99,666.74 × 40,390.74
  4. Step 4: Simplify right side
    72,221.78x = 4,025,613,180.03
  5. Step 5: Solve for x
    x = 4,025,613,180.03/72,221.78
  6. Step 6: Final answer
    x = 55,739.60

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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.