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Finding the Fourth Proportional to 86,999.32, 130,550.82 and 31,599.64

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Solution

The fourth proportional to 86,999.32, 130,550.82 and 31,599.64 is: 47,418.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,999.32 : 130,550.82 = 31,599.64 : x
  2. Step 2: Convert to fraction form
    86,999.32/130,550.82 = 31,599.64/x
  3. Step 3: Cross multiply
    86,999.32x = 130,550.82 × 31,599.64
  4. Step 4: Simplify right side
    86,999.32x = 4,125,358,913.70
  5. Step 5: Solve for x
    x = 4,125,358,913.70/86,999.32
  6. Step 6: Final answer
    x = 47,418.29

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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.