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Finding the Fourth Proportional to 105,087.20, 157,630.80 and 65,721.20

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Solution

The fourth proportional to 105,087.20, 157,630.80 and 65,721.20 is: 98,581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,087.20 : 157,630.80 = 65,721.20 : x
  2. Step 2: Convert to fraction form
    105,087.20/157,630.80 = 65,721.20/x
  3. Step 3: Cross multiply
    105,087.20x = 157,630.80 × 65,721.20
  4. Step 4: Simplify right side
    105,087.20x = 10,359,685,332.96
  5. Step 5: Solve for x
    x = 10,359,685,332.96/105,087.20
  6. Step 6: Final answer
    x = 98,581.80

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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.