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Finding the Fourth Proportional to 72,458.64, 99,990.56 and 40,193.12

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Solution

The fourth proportional to 72,458.64, 99,990.56 and 40,193.12 is: 55,465.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,458.64 : 99,990.56 = 40,193.12 : x
  2. Step 2: Convert to fraction form
    72,458.64/99,990.56 = 40,193.12/x
  3. Step 3: Cross multiply
    72,458.64x = 99,990.56 × 40,193.12
  4. Step 4: Simplify right side
    72,458.64x = 4,018,932,576.95
  5. Step 5: Solve for x
    x = 4,018,932,576.95/72,458.64
  6. Step 6: Final answer
    x = 55,465.19

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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.