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Finding the Fourth Proportional to 131,605.50, 181,615.60 and 71,989.50

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Solution

The fourth proportional to 131,605.50, 181,615.60 and 71,989.50 is: 99,345.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,605.50 : 181,615.60 = 71,989.50 : x
  2. Step 2: Convert to fraction form
    131,605.50/181,615.60 = 71,989.50/x
  3. Step 3: Cross multiply
    131,605.50x = 181,615.60 × 71,989.50
  4. Step 4: Simplify right side
    131,605.50x = 13,074,416,236.20
  5. Step 5: Solve for x
    x = 13,074,416,236.20/131,605.50
  6. Step 6: Final answer
    x = 99,345.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.