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Finding the Fourth Proportional to 86,805.60, 130,208.40 and 31,388.64

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Solution

The fourth proportional to 86,805.60, 130,208.40 and 31,388.64 is: 47,082.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,805.60 : 130,208.40 = 31,388.64 : x
  2. Step 2: Convert to fraction form
    86,805.60/130,208.40 = 31,388.64/x
  3. Step 3: Cross multiply
    86,805.60x = 130,208.40 × 31,388.64
  4. Step 4: Simplify right side
    86,805.60x = 4,087,064,592.58
  5. Step 5: Solve for x
    x = 4,087,064,592.58/86,805.60
  6. Step 6: Final answer
    x = 47,082.96

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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.