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Finding the Fourth Proportional to 903.40, 1,355.28 and 383.40

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Solution

The fourth proportional to 903.40, 1,355.28 and 383.40 is: 575.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.40 : 1,355.28 = 383.40 : x
  2. Step 2: Convert to fraction form
    903.40/1,355.28 = 383.40/x
  3. Step 3: Cross multiply
    903.40x = 1,355.28 × 383.40
  4. Step 4: Simplify right side
    903.40x = 519,614.35
  5. Step 5: Solve for x
    x = 519,614.35/903.40
  6. Step 6: Final answer
    x = 575.18

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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.