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Finding the Fourth Proportional to 904.87, 1,357.35 and 255.61

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Solution

The fourth proportional to 904.87, 1,357.35 and 255.61 is: 383.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.87 : 1,357.35 = 255.61 : x
  2. Step 2: Convert to fraction form
    904.87/1,357.35 = 255.61/x
  3. Step 3: Cross multiply
    904.87x = 1,357.35 × 255.61
  4. Step 4: Simplify right side
    904.87x = 346,952.23
  5. Step 5: Solve for x
    x = 346,952.23/904.87
  6. Step 6: Final answer
    x = 383.43

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Double scale
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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.