Home / 129,357.90-178,513.65-72,769.28

Finding the Fourth Proportional to 129,357.90, 178,513.65 and 72,769.28

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Solution

The fourth proportional to 129,357.90, 178,513.65 and 72,769.28 is: 100,421.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,357.90 : 178,513.65 = 72,769.28 : x
  2. Step 2: Convert to fraction form
    129,357.90/178,513.65 = 72,769.28/x
  3. Step 3: Cross multiply
    129,357.90x = 178,513.65 × 72,769.28
  4. Step 4: Simplify right side
    129,357.90x = 12,990,308,888.10
  5. Step 5: Solve for x
    x = 12,990,308,888.10/129,357.90
  6. Step 6: Final answer
    x = 100,421.46

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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.