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Finding the Fourth Proportional to 86,643.90, 129,670.15 and 72,619.77

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Solution

The fourth proportional to 86,643.90, 129,670.15 and 72,619.77 is: 108,681.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,643.90 : 129,670.15 = 72,619.77 : x
  2. Step 2: Convert to fraction form
    86,643.90/129,670.15 = 72,619.77/x
  3. Step 3: Cross multiply
    86,643.90x = 129,670.15 × 72,619.77
  4. Step 4: Simplify right side
    86,643.90x = 9,416,616,468.87
  5. Step 5: Solve for x
    x = 9,416,616,468.87/86,643.90
  6. Step 6: Final answer
    x = 108,681.82

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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.