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Finding the Fourth Proportional to 870.56, 1,201.17 and 492.46

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Solution

The fourth proportional to 870.56, 1,201.17 and 492.46 is: 679.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.56 : 1,201.17 = 492.46 : x
  2. Step 2: Convert to fraction form
    870.56/1,201.17 = 492.46/x
  3. Step 3: Cross multiply
    870.56x = 1,201.17 × 492.46
  4. Step 4: Simplify right side
    870.56x = 591,522.87
  5. Step 5: Solve for x
    x = 591,522.87/870.56
  6. Step 6: Final answer
    x = 679.47

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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.