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Finding the Fourth Proportional to 1,388.54, 1,915.26 and 864.84

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Solution

The fourth proportional to 1,388.54, 1,915.26 and 864.84 is: 1,192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.54 : 1,915.26 = 864.84 : x
  2. Step 2: Convert to fraction form
    1,388.54/1,915.26 = 864.84/x
  3. Step 3: Cross multiply
    1,388.54x = 1,915.26 × 864.84
  4. Step 4: Simplify right side
    1,388.54x = 1,656,393.46
  5. Step 5: Solve for x
    x = 1,656,393.46/1,388.54
  6. Step 6: Final answer
    x = 1,192.90

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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.