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Finding the Fourth Proportional to 915.45, 1,262.30 and 667.59

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Solution

The fourth proportional to 915.45, 1,262.30 and 667.59 is: 920.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.45 : 1,262.30 = 667.59 : x
  2. Step 2: Convert to fraction form
    915.45/1,262.30 = 667.59/x
  3. Step 3: Cross multiply
    915.45x = 1,262.30 × 667.59
  4. Step 4: Simplify right side
    915.45x = 842,695.52
  5. Step 5: Solve for x
    x = 842,695.52/915.45
  6. Step 6: Final answer
    x = 920.53

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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.