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Finding the Fourth Proportional to 912.36, 1,259.18 and 690.96

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Solution

The fourth proportional to 912.36, 1,259.18 and 690.96 is: 953.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.36 : 1,259.18 = 690.96 : x
  2. Step 2: Convert to fraction form
    912.36/1,259.18 = 690.96/x
  3. Step 3: Cross multiply
    912.36x = 1,259.18 × 690.96
  4. Step 4: Simplify right side
    912.36x = 870,043.01
  5. Step 5: Solve for x
    x = 870,043.01/912.36
  6. Step 6: Final answer
    x = 953.62

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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.