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Finding the Fourth Proportional to 913.18, 1,259.60 and 633.28

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Solution

The fourth proportional to 913.18, 1,259.60 and 633.28 is: 873.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.18 : 1,259.60 = 633.28 : x
  2. Step 2: Convert to fraction form
    913.18/1,259.60 = 633.28/x
  3. Step 3: Cross multiply
    913.18x = 1,259.60 × 633.28
  4. Step 4: Simplify right side
    913.18x = 797,679.49
  5. Step 5: Solve for x
    x = 797,679.49/913.18
  6. Step 6: Final answer
    x = 873.52

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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.