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Finding the Fourth Proportional to 121,040.40, 181,560.60 and 42,128.40

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Solution

The fourth proportional to 121,040.40, 181,560.60 and 42,128.40 is: 63,192.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,040.40 : 181,560.60 = 42,128.40 : x
  2. Step 2: Convert to fraction form
    121,040.40/181,560.60 = 42,128.40/x
  3. Step 3: Cross multiply
    121,040.40x = 181,560.60 × 42,128.40
  4. Step 4: Simplify right side
    121,040.40x = 7,648,857,581.04
  5. Step 5: Solve for x
    x = 7,648,857,581.04/121,040.40
  6. Step 6: Final answer
    x = 63,192.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.