Home / 129,402.05-178,570.45-72,802.49

Finding the Fourth Proportional to 129,402.05, 178,570.45 and 72,802.49

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Solution

The fourth proportional to 129,402.05, 178,570.45 and 72,802.49 is: 100,464.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,402.05 : 178,570.45 = 72,802.49 : x
  2. Step 2: Convert to fraction form
    129,402.05/178,570.45 = 72,802.49/x
  3. Step 3: Cross multiply
    129,402.05x = 178,570.45 × 72,802.49
  4. Step 4: Simplify right side
    129,402.05x = 13,000,372,189.06
  5. Step 5: Solve for x
    x = 13,000,372,189.06/129,402.05
  6. Step 6: Final answer
    x = 100,464.97

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1.5x scale

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.