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Finding the Fourth Proportional to 903.80, 1,355.67 and 383.47

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Solution

The fourth proportional to 903.80, 1,355.67 and 383.47 is: 575.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.80 : 1,355.67 = 383.47 : x
  2. Step 2: Convert to fraction form
    903.80/1,355.67 = 383.47/x
  3. Step 3: Cross multiply
    903.80x = 1,355.67 × 383.47
  4. Step 4: Simplify right side
    903.80x = 519,859.73
  5. Step 5: Solve for x
    x = 519,859.73/903.80
  6. Step 6: Final answer
    x = 575.19

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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.