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Finding the Fourth Proportional to 898.08, 1,239.76 and 636.24

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Solution

The fourth proportional to 898.08, 1,239.76 and 636.24 is: 878.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.08 : 1,239.76 = 636.24 : x
  2. Step 2: Convert to fraction form
    898.08/1,239.76 = 636.24/x
  3. Step 3: Cross multiply
    898.08x = 1,239.76 × 636.24
  4. Step 4: Simplify right side
    898.08x = 788,784.90
  5. Step 5: Solve for x
    x = 788,784.90/898.08
  6. Step 6: Final answer
    x = 878.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.