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Finding the Fourth Proportional to 85,438.76, 128,181.18 and 77,213.48

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Solution

The fourth proportional to 85,438.76, 128,181.18 and 77,213.48 is: 115,841.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,438.76 : 128,181.18 = 77,213.48 : x
  2. Step 2: Convert to fraction form
    85,438.76/128,181.18 = 77,213.48/x
  3. Step 3: Cross multiply
    85,438.76x = 128,181.18 × 77,213.48
  4. Step 4: Simplify right side
    85,438.76x = 9,897,314,978.31
  5. Step 5: Solve for x
    x = 9,897,314,978.31/85,438.76
  6. Step 6: Final answer
    x = 115,841.04

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1.5x scale

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.