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Finding the Fourth Proportional to 129,417.60, 178,588.80 and 72,825.60

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Solution

The fourth proportional to 129,417.60, 178,588.80 and 72,825.60 is: 100,495.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,417.60 : 178,588.80 = 72,825.60 : x
  2. Step 2: Convert to fraction form
    129,417.60/178,588.80 = 72,825.60/x
  3. Step 3: Cross multiply
    129,417.60x = 178,588.80 × 72,825.60
  4. Step 4: Simplify right side
    129,417.60x = 13,005,836,513.28
  5. Step 5: Solve for x
    x = 13,005,836,513.28/129,417.60
  6. Step 6: Final answer
    x = 100,495.11

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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.