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Finding the Fourth Proportional to 912.96, 1,259.16 and 689.64

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Solution

The fourth proportional to 912.96, 1,259.16 and 689.64 is: 951.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.96 : 1,259.16 = 689.64 : x
  2. Step 2: Convert to fraction form
    912.96/1,259.16 = 689.64/x
  3. Step 3: Cross multiply
    912.96x = 1,259.16 × 689.64
  4. Step 4: Simplify right side
    912.96x = 868,367.10
  5. Step 5: Solve for x
    x = 868,367.10/912.96
  6. Step 6: Final answer
    x = 951.16

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1.5x scale

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.