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Finding the Fourth Proportional to 77,042.90, 115,440.15 and 43,663.70

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Solution

The fourth proportional to 77,042.90, 115,440.15 and 43,663.70 is: 65,425.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,042.90 : 115,440.15 = 43,663.70 : x
  2. Step 2: Convert to fraction form
    77,042.90/115,440.15 = 43,663.70/x
  3. Step 3: Cross multiply
    77,042.90x = 115,440.15 × 43,663.70
  4. Step 4: Simplify right side
    77,042.90x = 5,040,544,077.56
  5. Step 5: Solve for x
    x = 5,040,544,077.56/77,042.90
  6. Step 6: Final answer
    x = 65,425.16

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1.5x scale

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.