Home / 121,320.90-181,981.35-76,815.45

Finding the Fourth Proportional to 121,320.90, 181,981.35 and 76,815.45

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Solution

The fourth proportional to 121,320.90, 181,981.35 and 76,815.45 is: 115,223.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,320.90 : 181,981.35 = 76,815.45 : x
  2. Step 2: Convert to fraction form
    121,320.90/181,981.35 = 76,815.45/x
  3. Step 3: Cross multiply
    121,320.90x = 181,981.35 × 76,815.45
  4. Step 4: Simplify right side
    121,320.90x = 13,978,979,291.86
  5. Step 5: Solve for x
    x = 13,978,979,291.86/121,320.90
  6. Step 6: Final answer
    x = 115,223.18

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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.