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Finding the Fourth Proportional to 138,938.40, 208,407.60 and 45,421.60

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Solution

The fourth proportional to 138,938.40, 208,407.60 and 45,421.60 is: 68,132.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,938.40 : 208,407.60 = 45,421.60 : x
  2. Step 2: Convert to fraction form
    138,938.40/208,407.60 = 45,421.60/x
  3. Step 3: Cross multiply
    138,938.40x = 208,407.60 × 45,421.60
  4. Step 4: Simplify right side
    138,938.40x = 9,466,206,644.16
  5. Step 5: Solve for x
    x = 9,466,206,644.16/138,938.40
  6. Step 6: Final answer
    x = 68,132.40

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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.