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Finding the Fourth Proportional to 71,790.40, 107,570.40 and 67,643.20

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Solution

The fourth proportional to 71,790.40, 107,570.40 and 67,643.20 is: 101,356.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,790.40 : 107,570.40 = 67,643.20 : x
  2. Step 2: Convert to fraction form
    71,790.40/107,570.40 = 67,643.20/x
  3. Step 3: Cross multiply
    71,790.40x = 107,570.40 × 67,643.20
  4. Step 4: Simplify right side
    71,790.40x = 7,276,406,081.28
  5. Step 5: Solve for x
    x = 7,276,406,081.28/71,790.40
  6. Step 6: Final answer
    x = 101,356.25

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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.