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Finding the Fourth Proportional to 858.76, 1,287.06 and 424.96

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Solution

The fourth proportional to 858.76, 1,287.06 and 424.96 is: 636.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.76 : 1,287.06 = 424.96 : x
  2. Step 2: Convert to fraction form
    858.76/1,287.06 = 424.96/x
  3. Step 3: Cross multiply
    858.76x = 1,287.06 × 424.96
  4. Step 4: Simplify right side
    858.76x = 546,949.02
  5. Step 5: Solve for x
    x = 546,949.02/858.76
  6. Step 6: Final answer
    x = 636.91

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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.