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Finding the Fourth Proportional to 1,661.43, 2,292.78 and 915.39

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Solution

The fourth proportional to 1,661.43, 2,292.78 and 915.39 is: 1,263.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.43 : 2,292.78 = 915.39 : x
  2. Step 2: Convert to fraction form
    1,661.43/2,292.78 = 915.39/x
  3. Step 3: Cross multiply
    1,661.43x = 2,292.78 × 915.39
  4. Step 4: Simplify right side
    1,661.43x = 2,098,786.17
  5. Step 5: Solve for x
    x = 2,098,786.17/1,661.43
  6. Step 6: Final answer
    x = 1,263.24

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1.5x scale

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.