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Finding the Fourth Proportional to 871.75, 1,307.63 and 255.43

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Solution

The fourth proportional to 871.75, 1,307.63 and 255.43 is: 383.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.75 : 1,307.63 = 255.43 : x
  2. Step 2: Convert to fraction form
    871.75/1,307.63 = 255.43/x
  3. Step 3: Cross multiply
    871.75x = 1,307.63 × 255.43
  4. Step 4: Simplify right side
    871.75x = 334,007.93
  5. Step 5: Solve for x
    x = 334,007.93/871.75
  6. Step 6: Final answer
    x = 383.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.