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Finding the Fourth Proportional to 147,128.90, 220,693.35 and 84,920.90

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Solution

The fourth proportional to 147,128.90, 220,693.35 and 84,920.90 is: 127,381.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,128.90 : 220,693.35 = 84,920.90 : x
  2. Step 2: Convert to fraction form
    147,128.90/220,693.35 = 84,920.90/x
  3. Step 3: Cross multiply
    147,128.90x = 220,693.35 × 84,920.90
  4. Step 4: Simplify right side
    147,128.90x = 18,741,477,906.02
  5. Step 5: Solve for x
    x = 18,741,477,906.02/147,128.90
  6. Step 6: Final answer
    x = 127,381.35

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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.