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Finding the Fourth Proportional to 121,130.40, 181,695.60 and 68,642.40

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Solution

The fourth proportional to 121,130.40, 181,695.60 and 68,642.40 is: 102,963.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,130.40 : 181,695.60 = 68,642.40 : x
  2. Step 2: Convert to fraction form
    121,130.40/181,695.60 = 68,642.40/x
  3. Step 3: Cross multiply
    121,130.40x = 181,695.60 × 68,642.40
  4. Step 4: Simplify right side
    121,130.40x = 12,472,022,053.44
  5. Step 5: Solve for x
    x = 12,472,022,053.44/121,130.40
  6. Step 6: Final answer
    x = 102,963.60

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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.