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Finding the Fourth Proportional to 129,681.80, 178,957.32 and 72,322.84

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Solution

The fourth proportional to 129,681.80, 178,957.32 and 72,322.84 is: 99,803.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,681.80 : 178,957.32 = 72,322.84 : x
  2. Step 2: Convert to fraction form
    129,681.80/178,957.32 = 72,322.84/x
  3. Step 3: Cross multiply
    129,681.80x = 178,957.32 × 72,322.84
  4. Step 4: Simplify right side
    129,681.80x = 12,942,701,621.19
  5. Step 5: Solve for x
    x = 12,942,701,621.19/129,681.80
  6. Step 6: Final answer
    x = 99,803.53

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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.