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Finding the Fourth Proportional to 138,903.16, 208,360.50 and 40,407.16

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Solution

The fourth proportional to 138,903.16, 208,360.50 and 40,407.16 is: 60,612.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,903.16 : 208,360.50 = 40,407.16 : x
  2. Step 2: Convert to fraction form
    138,903.16/208,360.50 = 40,407.16/x
  3. Step 3: Cross multiply
    138,903.16x = 208,360.50 × 40,407.16
  4. Step 4: Simplify right side
    138,903.16x = 8,419,256,061.18
  5. Step 5: Solve for x
    x = 8,419,256,061.18/138,903.16
  6. Step 6: Final answer
    x = 60,612.42

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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.