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Finding the Fourth Proportional to 870.21, 1,200.96 and 538.58

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Solution

The fourth proportional to 870.21, 1,200.96 and 538.58 is: 743.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.21 : 1,200.96 = 538.58 : x
  2. Step 2: Convert to fraction form
    870.21/1,200.96 = 538.58/x
  3. Step 3: Cross multiply
    870.21x = 1,200.96 × 538.58
  4. Step 4: Simplify right side
    870.21x = 646,816.04
  5. Step 5: Solve for x
    x = 646,816.04/870.21
  6. Step 6: Final answer
    x = 743.29

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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.