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Finding the Fourth Proportional to 912.90, 1,259.49 and 559.04

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Solution

The fourth proportional to 912.90, 1,259.49 and 559.04 is: 771.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.90 : 1,259.49 = 559.04 : x
  2. Step 2: Convert to fraction form
    912.90/1,259.49 = 559.04/x
  3. Step 3: Cross multiply
    912.90x = 1,259.49 × 559.04
  4. Step 4: Simplify right side
    912.90x = 704,102.49
  5. Step 5: Solve for x
    x = 704,102.49/912.90
  6. Step 6: Final answer
    x = 771.28

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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.