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Finding the Fourth Proportional to 859.76, 1,279.30 and 856.88

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Solution

The fourth proportional to 859.76, 1,279.30 and 856.88 is: 1,275.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.76 : 1,279.30 = 856.88 : x
  2. Step 2: Convert to fraction form
    859.76/1,279.30 = 856.88/x
  3. Step 3: Cross multiply
    859.76x = 1,279.30 × 856.88
  4. Step 4: Simplify right side
    859.76x = 1,096,206.58
  5. Step 5: Solve for x
    x = 1,096,206.58/859.76
  6. Step 6: Final answer
    x = 1,275.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.