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Finding the Fourth Proportional to 142,638.70, 214,111.65 and 80,430.70

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Solution

The fourth proportional to 142,638.70, 214,111.65 and 80,430.70 is: 120,732.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,638.70 : 214,111.65 = 80,430.70 : x
  2. Step 2: Convert to fraction form
    142,638.70/214,111.65 = 80,430.70/x
  3. Step 3: Cross multiply
    142,638.70x = 214,111.65 × 80,430.70
  4. Step 4: Simplify right side
    142,638.70x = 17,221,149,887.66
  5. Step 5: Solve for x
    x = 17,221,149,887.66/142,638.70
  6. Step 6: Final answer
    x = 120,732.66

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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.