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Finding the Fourth Proportional to 102,720, 141,765.12 and 58,010.88

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Solution

The fourth proportional to 102,720, 141,765.12 and 58,010.88 is: 80,061.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,720 : 141,765.12 = 58,010.88 : x
  2. Step 2: Convert to fraction form
    102,720/141,765.12 = 58,010.88/x
  3. Step 3: Cross multiply
    102,720x = 141,765.12 × 58,010.88
  4. Step 4: Simplify right side
    102,720x = 8,223,919,364.51
  5. Step 5: Solve for x
    x = 8,223,919,364.51/102,720
  6. Step 6: Final answer
    x = 80,061.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.