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Finding the Fourth Proportional to 43,152.30, 64,728.45 and 11,987.55

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Solution

The fourth proportional to 43,152.30, 64,728.45 and 11,987.55 is: 17,981.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,152.30 : 64,728.45 = 11,987.55 : x
  2. Step 2: Convert to fraction form
    43,152.30/64,728.45 = 11,987.55/x
  3. Step 3: Cross multiply
    43,152.30x = 64,728.45 × 11,987.55
  4. Step 4: Simplify right side
    43,152.30x = 775,935,530.80
  5. Step 5: Solve for x
    x = 775,935,530.80/43,152.30
  6. Step 6: Final answer
    x = 17,981.33

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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.