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Finding the Fourth Proportional to 121,130.60, 181,728.30 and 86,138.60

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Solution

The fourth proportional to 121,130.60, 181,728.30 and 86,138.60 is: 129,230.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,130.60 : 181,728.30 = 86,138.60 : x
  2. Step 2: Convert to fraction form
    121,130.60/181,728.30 = 86,138.60/x
  3. Step 3: Cross multiply
    121,130.60x = 181,728.30 × 86,138.60
  4. Step 4: Simplify right side
    121,130.60x = 15,653,821,342.38
  5. Step 5: Solve for x
    x = 15,653,821,342.38/121,130.60
  6. Step 6: Final answer
    x = 129,230.94

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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.