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Finding the Fourth Proportional to 86,034.90, 128,793.15 and 76,703.70

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Solution

The fourth proportional to 86,034.90, 128,793.15 and 76,703.70 is: 114,824.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,034.90 : 128,793.15 = 76,703.70 : x
  2. Step 2: Convert to fraction form
    86,034.90/128,793.15 = 76,703.70/x
  3. Step 3: Cross multiply
    86,034.90x = 128,793.15 × 76,703.70
  4. Step 4: Simplify right side
    86,034.90x = 9,878,911,139.66
  5. Step 5: Solve for x
    x = 9,878,911,139.66/86,034.90
  6. Step 6: Final answer
    x = 114,824.46

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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.