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Finding the Fourth Proportional to 121,278.20, 170,139.40 and 121,278.20

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Solution

The fourth proportional to 121,278.20, 170,139.40 and 121,278.20 is: 170,139.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,278.20 : 170,139.40 = 121,278.20 : x
  2. Step 2: Convert to fraction form
    121,278.20/170,139.40 = 121,278.20/x
  3. Step 3: Cross multiply
    121,278.20x = 170,139.40 × 121,278.20
  4. Step 4: Simplify right side
    121,278.20x = 20,634,200,181.08
  5. Step 5: Solve for x
    x = 20,634,200,181.08/121,278.20
  6. Step 6: Final answer
    x = 170,139.40

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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.