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Finding the Fourth Proportional to 1,518.88, 2,279.28 and 870.88

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Solution

The fourth proportional to 1,518.88, 2,279.28 and 870.88 is: 1,306.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.88 : 2,279.28 = 870.88 : x
  2. Step 2: Convert to fraction form
    1,518.88/2,279.28 = 870.88/x
  3. Step 3: Cross multiply
    1,518.88x = 2,279.28 × 870.88
  4. Step 4: Simplify right side
    1,518.88x = 1,984,979.37
  5. Step 5: Solve for x
    x = 1,984,979.37/1,518.88
  6. Step 6: Final answer
    x = 1,306.87

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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.