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Finding the Fourth Proportional to 1,279.12, 1,765.92 and 860.08

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Solution

The fourth proportional to 1,279.12, 1,765.92 and 860.08 is: 1,187.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.12 : 1,765.92 = 860.08 : x
  2. Step 2: Convert to fraction form
    1,279.12/1,765.92 = 860.08/x
  3. Step 3: Cross multiply
    1,279.12x = 1,765.92 × 860.08
  4. Step 4: Simplify right side
    1,279.12x = 1,518,832.47
  5. Step 5: Solve for x
    x = 1,518,832.47/1,279.12
  6. Step 6: Final answer
    x = 1,187.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.