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Finding the Fourth Proportional to 81,438.40, 110,335.50 and 81,438.40

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Solution

The fourth proportional to 81,438.40, 110,335.50 and 81,438.40 is: 110,335.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,438.40 : 110,335.50 = 81,438.40 : x
  2. Step 2: Convert to fraction form
    81,438.40/110,335.50 = 81,438.40/x
  3. Step 3: Cross multiply
    81,438.40x = 110,335.50 × 81,438.40
  4. Step 4: Simplify right side
    81,438.40x = 8,985,546,583.20
  5. Step 5: Solve for x
    x = 8,985,546,583.20/81,438.40
  6. Step 6: Final answer
    x = 110,335.50

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.