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Finding the Fourth Proportional to 86,645.49, 129,672.51 and 72,621.36

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Solution

The fourth proportional to 86,645.49, 129,672.51 and 72,621.36 is: 108,684.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,645.49 : 129,672.51 = 72,621.36 : x
  2. Step 2: Convert to fraction form
    86,645.49/129,672.51 = 72,621.36/x
  3. Step 3: Cross multiply
    86,645.49x = 129,672.51 × 72,621.36
  4. Step 4: Simplify right side
    86,645.49x = 9,416,994,030.81
  5. Step 5: Solve for x
    x = 9,416,994,030.81/86,645.49
  6. Step 6: Final answer
    x = 108,684.18

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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.