Home / 129,143.77-178,221.69-70,999.79

Finding the Fourth Proportional to 129,143.77, 178,221.69 and 70,999.79

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Solution

The fourth proportional to 129,143.77, 178,221.69 and 70,999.79 is: 97,981.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,143.77 : 178,221.69 = 70,999.79 : x
  2. Step 2: Convert to fraction form
    129,143.77/178,221.69 = 70,999.79/x
  3. Step 3: Cross multiply
    129,143.77x = 178,221.69 × 70,999.79
  4. Step 4: Simplify right side
    129,143.77x = 12,653,701,317.34
  5. Step 5: Solve for x
    x = 12,653,701,317.34/129,143.77
  6. Step 6: Final answer
    x = 97,981.51

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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.