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Finding the Fourth Proportional to 913.45, 1,260.71 and 581.53

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Solution

The fourth proportional to 913.45, 1,260.71 and 581.53 is: 802.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.45 : 1,260.71 = 581.53 : x
  2. Step 2: Convert to fraction form
    913.45/1,260.71 = 581.53/x
  3. Step 3: Cross multiply
    913.45x = 1,260.71 × 581.53
  4. Step 4: Simplify right side
    913.45x = 733,140.69
  5. Step 5: Solve for x
    x = 733,140.69/913.45
  6. Step 6: Final answer
    x = 802.61

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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.