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Finding the Fourth Proportional to 265,987.80, 398,981.70 and 78,999.30

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Solution

The fourth proportional to 265,987.80, 398,981.70 and 78,999.30 is: 118,498.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,987.80 : 398,981.70 = 78,999.30 : x
  2. Step 2: Convert to fraction form
    265,987.80/398,981.70 = 78,999.30/x
  3. Step 3: Cross multiply
    265,987.80x = 398,981.70 × 78,999.30
  4. Step 4: Simplify right side
    265,987.80x = 31,519,275,012.81
  5. Step 5: Solve for x
    x = 31,519,275,012.81/265,987.80
  6. Step 6: Final answer
    x = 118,498.95

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Similar ratio
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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.