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Finding the Fourth Proportional to 915.95, 1,373.75 and 762.86

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Solution

The fourth proportional to 915.95, 1,373.75 and 762.86 is: 1,144.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.95 : 1,373.75 = 762.86 : x
  2. Step 2: Convert to fraction form
    915.95/1,373.75 = 762.86/x
  3. Step 3: Cross multiply
    915.95x = 1,373.75 × 762.86
  4. Step 4: Simplify right side
    915.95x = 1,047,968.24
  5. Step 5: Solve for x
    x = 1,047,968.24/915.95
  6. Step 6: Final answer
    x = 1,144.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.