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Finding the Fourth Proportional to 99,859.32, 137,806.80 and 56,836.71

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Solution

The fourth proportional to 99,859.32, 137,806.80 and 56,836.71 is: 78,435.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,859.32 : 137,806.80 = 56,836.71 : x
  2. Step 2: Convert to fraction form
    99,859.32/137,806.80 = 56,836.71/x
  3. Step 3: Cross multiply
    99,859.32x = 137,806.80 × 56,836.71
  4. Step 4: Simplify right side
    99,859.32x = 7,832,485,127.63
  5. Step 5: Solve for x
    x = 7,832,485,127.63/99,859.32
  6. Step 6: Final answer
    x = 78,435.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.