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Finding the Fourth Proportional to 1,358.61, 1,871.97 and 915.74

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Solution

The fourth proportional to 1,358.61, 1,871.97 and 915.74 is: 1,261.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.61 : 1,871.97 = 915.74 : x
  2. Step 2: Convert to fraction form
    1,358.61/1,871.97 = 915.74/x
  3. Step 3: Cross multiply
    1,358.61x = 1,871.97 × 915.74
  4. Step 4: Simplify right side
    1,358.61x = 1,714,228.45
  5. Step 5: Solve for x
    x = 1,714,228.45/1,358.61
  6. Step 6: Final answer
    x = 1,261.75

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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.