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Finding the Fourth Proportional to 129,493.81, 178,802.81 and 101,279.89

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Solution

The fourth proportional to 129,493.81, 178,802.81 and 101,279.89 is: 139,845.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,493.81 : 178,802.81 = 101,279.89 : x
  2. Step 2: Convert to fraction form
    129,493.81/178,802.81 = 101,279.89/x
  3. Step 3: Cross multiply
    129,493.81x = 178,802.81 × 101,279.89
  4. Step 4: Simplify right side
    129,493.81x = 18,109,128,422.09
  5. Step 5: Solve for x
    x = 18,109,128,422.09/129,493.81
  6. Step 6: Final answer
    x = 139,845.51

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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.