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Finding the Fourth Proportional to 915.96, 1,263.30 and 668.10

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Solution

The fourth proportional to 915.96, 1,263.30 and 668.10 is: 921.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.96 : 1,263.30 = 668.10 : x
  2. Step 2: Convert to fraction form
    915.96/1,263.30 = 668.10/x
  3. Step 3: Cross multiply
    915.96x = 1,263.30 × 668.10
  4. Step 4: Simplify right side
    915.96x = 844,010.73
  5. Step 5: Solve for x
    x = 844,010.73/915.96
  6. Step 6: Final answer
    x = 921.45

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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.