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Finding the Fourth Proportional to 86,697.30, 129,851.55 and 71,145.30

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Solution

The fourth proportional to 86,697.30, 129,851.55 and 71,145.30 is: 106,558.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,697.30 : 129,851.55 = 71,145.30 : x
  2. Step 2: Convert to fraction form
    86,697.30/129,851.55 = 71,145.30/x
  3. Step 3: Cross multiply
    86,697.30x = 129,851.55 × 71,145.30
  4. Step 4: Simplify right side
    86,697.30x = 9,238,327,480.22
  5. Step 5: Solve for x
    x = 9,238,327,480.22/86,697.30
  6. Step 6: Final answer
    x = 106,558.42

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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.