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Finding the Fourth Proportional to 915.71, 1,263.40 and 798.86

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Solution

The fourth proportional to 915.71, 1,263.40 and 798.86 is: 1,102.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.71 : 1,263.40 = 798.86 : x
  2. Step 2: Convert to fraction form
    915.71/1,263.40 = 798.86/x
  3. Step 3: Cross multiply
    915.71x = 1,263.40 × 798.86
  4. Step 4: Simplify right side
    915.71x = 1,009,280.89
  5. Step 5: Solve for x
    x = 1,009,280.89/915.71
  6. Step 6: Final answer
    x = 1,102.19

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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.