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Finding the Fourth Proportional to 121,126.40, 169,715.20 and 121,126.40

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Solution

The fourth proportional to 121,126.40, 169,715.20 and 121,126.40 is: 169,715.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,126.40 : 169,715.20 = 121,126.40 : x
  2. Step 2: Convert to fraction form
    121,126.40/169,715.20 = 121,126.40/x
  3. Step 3: Cross multiply
    121,126.40x = 169,715.20 × 121,126.40
  4. Step 4: Simplify right side
    121,126.40x = 20,556,991,201.28
  5. Step 5: Solve for x
    x = 20,556,991,201.28/121,126.40
  6. Step 6: Final answer
    x = 169,715.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.