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Finding the Fourth Proportional to 870.04, 1,201.50 and 821.56

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Solution

The fourth proportional to 870.04, 1,201.50 and 821.56 is: 1,134.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.04 : 1,201.50 = 821.56 : x
  2. Step 2: Convert to fraction form
    870.04/1,201.50 = 821.56/x
  3. Step 3: Cross multiply
    870.04x = 1,201.50 × 821.56
  4. Step 4: Simplify right side
    870.04x = 987,104.34
  5. Step 5: Solve for x
    x = 987,104.34/870.04
  6. Step 6: Final answer
    x = 1,134.55

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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.