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Finding the Fourth Proportional to 86,531.60, 121,319.20 and 86,531.60

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Solution

The fourth proportional to 86,531.60, 121,319.20 and 86,531.60 is: 121,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,531.60 : 121,319.20 = 86,531.60 : x
  2. Step 2: Convert to fraction form
    86,531.60/121,319.20 = 86,531.60/x
  3. Step 3: Cross multiply
    86,531.60x = 121,319.20 × 86,531.60
  4. Step 4: Simplify right side
    86,531.60x = 10,497,944,486.72
  5. Step 5: Solve for x
    x = 10,497,944,486.72/86,531.60
  6. Step 6: Final answer
    x = 121,319.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.