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Finding the Fourth Proportional to 904.50, 1,248.21 and 642.97

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Solution

The fourth proportional to 904.50, 1,248.21 and 642.97 is: 887.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.50 : 1,248.21 = 642.97 : x
  2. Step 2: Convert to fraction form
    904.50/1,248.21 = 642.97/x
  3. Step 3: Cross multiply
    904.50x = 1,248.21 × 642.97
  4. Step 4: Simplify right side
    904.50x = 802,563.14
  5. Step 5: Solve for x
    x = 802,563.14/904.50
  6. Step 6: Final answer
    x = 887.30

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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.