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Finding the Fourth Proportional to 904.74, 1,357.20 and 255.57

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Solution

The fourth proportional to 904.74, 1,357.20 and 255.57 is: 383.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.74 : 1,357.20 = 255.57 : x
  2. Step 2: Convert to fraction form
    904.74/1,357.20 = 255.57/x
  3. Step 3: Cross multiply
    904.74x = 1,357.20 × 255.57
  4. Step 4: Simplify right side
    904.74x = 346,859.60
  5. Step 5: Solve for x
    x = 346,859.60/904.74
  6. Step 6: Final answer
    x = 383.38

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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.