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Finding the Fourth Proportional to 870.89, 1,200.96 and 634.43

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Solution

The fourth proportional to 870.89, 1,200.96 and 634.43 is: 874.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.89 : 1,200.96 = 634.43 : x
  2. Step 2: Convert to fraction form
    870.89/1,200.96 = 634.43/x
  3. Step 3: Cross multiply
    870.89x = 1,200.96 × 634.43
  4. Step 4: Simplify right side
    870.89x = 761,928.06
  5. Step 5: Solve for x
    x = 761,928.06/870.89
  6. Step 6: Final answer
    x = 874.89

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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.