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Finding the Fourth Proportional to 89,909.90, 134,821.74 and 42,485.51

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Solution

The fourth proportional to 89,909.90, 134,821.74 and 42,485.51 is: 63,707.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,909.90 : 134,821.74 = 42,485.51 : x
  2. Step 2: Convert to fraction form
    89,909.90/134,821.74 = 42,485.51/x
  3. Step 3: Cross multiply
    89,909.90x = 134,821.74 × 42,485.51
  4. Step 4: Simplify right side
    89,909.90x = 5,727,970,382.99
  5. Step 5: Solve for x
    x = 5,727,970,382.99/89,909.90
  6. Step 6: Final answer
    x = 63,707.89

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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.