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Finding the Fourth Proportional to 2,312.76, 3,470.40 and 851.70

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Solution

The fourth proportional to 2,312.76, 3,470.40 and 851.70 is: 1,278.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,312.76 : 3,470.40 = 851.70 : x
  2. Step 2: Convert to fraction form
    2,312.76/3,470.40 = 851.70/x
  3. Step 3: Cross multiply
    2,312.76x = 3,470.40 × 851.70
  4. Step 4: Simplify right side
    2,312.76x = 2,955,739.68
  5. Step 5: Solve for x
    x = 2,955,739.68/2,312.76
  6. Step 6: Final answer
    x = 1,278.01

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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.