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Finding the Fourth Proportional to 161,920.80, 242,990.55 and 90,843.30

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Solution

The fourth proportional to 161,920.80, 242,990.55 and 90,843.30 is: 136,326.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,920.80 : 242,990.55 = 90,843.30 : x
  2. Step 2: Convert to fraction form
    161,920.80/242,990.55 = 90,843.30/x
  3. Step 3: Cross multiply
    161,920.80x = 242,990.55 × 90,843.30
  4. Step 4: Simplify right side
    161,920.80x = 22,074,063,430.82
  5. Step 5: Solve for x
    x = 22,074,063,430.82/161,920.80
  6. Step 6: Final answer
    x = 136,326.30

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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.