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Finding the Fourth Proportional to 851.31, 1,275.75 and 607.91

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Solution

The fourth proportional to 851.31, 1,275.75 and 607.91 is: 910.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.31 : 1,275.75 = 607.91 : x
  2. Step 2: Convert to fraction form
    851.31/1,275.75 = 607.91/x
  3. Step 3: Cross multiply
    851.31x = 1,275.75 × 607.91
  4. Step 4: Simplify right side
    851.31x = 775,534.80
  5. Step 5: Solve for x
    x = 775,534.80/851.31
  6. Step 6: Final answer
    x = 910.99

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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.