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Finding the Fourth Proportional to 912.40, 1,259.68 and 663.48

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Solution

The fourth proportional to 912.40, 1,259.68 and 663.48 is: 916.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.40 : 1,259.68 = 663.48 : x
  2. Step 2: Convert to fraction form
    912.40/1,259.68 = 663.48/x
  3. Step 3: Cross multiply
    912.40x = 1,259.68 × 663.48
  4. Step 4: Simplify right side
    912.40x = 835,772.49
  5. Step 5: Solve for x
    x = 835,772.49/912.40
  6. Step 6: Final answer
    x = 916.02

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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.