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Finding the Fourth Proportional to 65,619.72, 90,526.82 and 40,127.20

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Solution

The fourth proportional to 65,619.72, 90,526.82 and 40,127.20 is: 55,358.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,619.72 : 90,526.82 = 40,127.20 : x
  2. Step 2: Convert to fraction form
    65,619.72/90,526.82 = 40,127.20/x
  3. Step 3: Cross multiply
    65,619.72x = 90,526.82 × 40,127.20
  4. Step 4: Simplify right side
    65,619.72x = 3,632,587,384.55
  5. Step 5: Solve for x
    x = 3,632,587,384.55/65,619.72
  6. Step 6: Final answer
    x = 55,358.17

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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.