Home / 129,291.28-178,420.80-72,703.06

Finding the Fourth Proportional to 129,291.28, 178,420.80 and 72,703.06

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Solution

The fourth proportional to 129,291.28, 178,420.80 and 72,703.06 is: 100,329.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,291.28 : 178,420.80 = 72,703.06 : x
  2. Step 2: Convert to fraction form
    129,291.28/178,420.80 = 72,703.06/x
  3. Step 3: Cross multiply
    129,291.28x = 178,420.80 × 72,703.06
  4. Step 4: Simplify right side
    129,291.28x = 12,971,738,127.65
  5. Step 5: Solve for x
    x = 12,971,738,127.65/129,291.28
  6. Step 6: Final answer
    x = 100,329.57

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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.