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Finding the Fourth Proportional to 904.32, 1,356.66 and 493.20

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Solution

The fourth proportional to 904.32, 1,356.66 and 493.20 is: 739.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.32 : 1,356.66 = 493.20 : x
  2. Step 2: Convert to fraction form
    904.32/1,356.66 = 493.20/x
  3. Step 3: Cross multiply
    904.32x = 1,356.66 × 493.20
  4. Step 4: Simplify right side
    904.32x = 669,104.71
  5. Step 5: Solve for x
    x = 669,104.71/904.32
  6. Step 6: Final answer
    x = 739.90

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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.