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Finding the Fourth Proportional to 1,661.72, 2,293.10 and 915.60

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Solution

The fourth proportional to 1,661.72, 2,293.10 and 915.60 is: 1,263.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.72 : 2,293.10 = 915.60 : x
  2. Step 2: Convert to fraction form
    1,661.72/2,293.10 = 915.60/x
  3. Step 3: Cross multiply
    1,661.72x = 2,293.10 × 915.60
  4. Step 4: Simplify right side
    1,661.72x = 2,099,562.36
  5. Step 5: Solve for x
    x = 2,099,562.36/1,661.72
  6. Step 6: Final answer
    x = 1,263.49

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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.