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Finding the Fourth Proportional to 72,171, 99,597.78 and 40,345.20

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Solution

The fourth proportional to 72,171, 99,597.78 and 40,345.20 is: 55,677.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,171 : 99,597.78 = 40,345.20 : x
  2. Step 2: Convert to fraction form
    72,171/99,597.78 = 40,345.20/x
  3. Step 3: Cross multiply
    72,171x = 99,597.78 × 40,345.20
  4. Step 4: Simplify right side
    72,171x = 4,018,292,353.66
  5. Step 5: Solve for x
    x = 4,018,292,353.66/72,171
  6. Step 6: Final answer
    x = 55,677.38

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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.