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Finding the Fourth Proportional to 904.20, 1,355.25 and 493.53

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Solution

The fourth proportional to 904.20, 1,355.25 and 493.53 is: 739.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.20 : 1,355.25 = 493.53 : x
  2. Step 2: Convert to fraction form
    904.20/1,355.25 = 493.53/x
  3. Step 3: Cross multiply
    904.20x = 1,355.25 × 493.53
  4. Step 4: Simplify right side
    904.20x = 668,856.53
  5. Step 5: Solve for x
    x = 668,856.53/904.20
  6. Step 6: Final answer
    x = 739.72

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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.