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Finding the Fourth Proportional to 888.70, 1,226.40 and 515.75

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Solution

The fourth proportional to 888.70, 1,226.40 and 515.75 is: 711.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.70 : 1,226.40 = 515.75 : x
  2. Step 2: Convert to fraction form
    888.70/1,226.40 = 515.75/x
  3. Step 3: Cross multiply
    888.70x = 1,226.40 × 515.75
  4. Step 4: Simplify right side
    888.70x = 632,515.80
  5. Step 5: Solve for x
    x = 632,515.80/888.70
  6. Step 6: Final answer
    x = 711.73

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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.