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Finding the Fourth Proportional to 912.42, 1,259.55 and 633.60

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Solution

The fourth proportional to 912.42, 1,259.55 and 633.60 is: 874.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.42 : 1,259.55 = 633.60 : x
  2. Step 2: Convert to fraction form
    912.42/1,259.55 = 633.60/x
  3. Step 3: Cross multiply
    912.42x = 1,259.55 × 633.60
  4. Step 4: Simplify right side
    912.42x = 798,050.88
  5. Step 5: Solve for x
    x = 798,050.88/912.42
  6. Step 6: Final answer
    x = 874.65

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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.