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Finding the Fourth Proportional to 912.74, 1,260.50 and 581.31

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Solution

The fourth proportional to 912.74, 1,260.50 and 581.31 is: 802.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.74 : 1,260.50 = 581.31 : x
  2. Step 2: Convert to fraction form
    912.74/1,260.50 = 581.31/x
  3. Step 3: Cross multiply
    912.74x = 1,260.50 × 581.31
  4. Step 4: Simplify right side
    912.74x = 732,738.35
  5. Step 5: Solve for x
    x = 732,738.35/912.74
  6. Step 6: Final answer
    x = 802.79

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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.