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Finding the Fourth Proportional to 974.63, 1,344.80 and 581.78

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Solution

The fourth proportional to 974.63, 1,344.80 and 581.78 is: 802.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.63 : 1,344.80 = 581.78 : x
  2. Step 2: Convert to fraction form
    974.63/1,344.80 = 581.78/x
  3. Step 3: Cross multiply
    974.63x = 1,344.80 × 581.78
  4. Step 4: Simplify right side
    974.63x = 782,382.56
  5. Step 5: Solve for x
    x = 782,382.56/974.63
  6. Step 6: Final answer
    x = 802.75

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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.