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Finding the Fourth Proportional to 121,297.90, 181,946.85 and 81,640.30

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Solution

The fourth proportional to 121,297.90, 181,946.85 and 81,640.30 is: 122,460.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,297.90 : 181,946.85 = 81,640.30 : x
  2. Step 2: Convert to fraction form
    121,297.90/181,946.85 = 81,640.30/x
  3. Step 3: Cross multiply
    121,297.90x = 181,946.85 × 81,640.30
  4. Step 4: Simplify right side
    121,297.90x = 14,854,195,418.06
  5. Step 5: Solve for x
    x = 14,854,195,418.06/121,297.90
  6. Step 6: Final answer
    x = 122,460.45

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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.