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Finding the Fourth Proportional to 913.01, 1,260.43 and 615.80

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Solution

The fourth proportional to 913.01, 1,260.43 and 615.80 is: 850.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.01 : 1,260.43 = 615.80 : x
  2. Step 2: Convert to fraction form
    913.01/1,260.43 = 615.80/x
  3. Step 3: Cross multiply
    913.01x = 1,260.43 × 615.80
  4. Step 4: Simplify right side
    913.01x = 776,174.41
  5. Step 5: Solve for x
    x = 776,174.41/913.01
  6. Step 6: Final answer
    x = 850.13

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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.