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Finding the Fourth Proportional to 1,289.52, 1,776.53 and 915.91

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Solution

The fourth proportional to 1,289.52, 1,776.53 and 915.91 is: 1,261.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.52 : 1,776.53 = 915.91 : x
  2. Step 2: Convert to fraction form
    1,289.52/1,776.53 = 915.91/x
  3. Step 3: Cross multiply
    1,289.52x = 1,776.53 × 915.91
  4. Step 4: Simplify right side
    1,289.52x = 1,627,139.44
  5. Step 5: Solve for x
    x = 1,627,139.44/1,289.52
  6. Step 6: Final answer
    x = 1,261.82

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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.