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Finding the Fourth Proportional to 904.45, 1,356.62 and 319.48

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Solution

The fourth proportional to 904.45, 1,356.62 and 319.48 is: 479.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.45 : 1,356.62 = 319.48 : x
  2. Step 2: Convert to fraction form
    904.45/1,356.62 = 319.48/x
  3. Step 3: Cross multiply
    904.45x = 1,356.62 × 319.48
  4. Step 4: Simplify right side
    904.45x = 433,409.17
  5. Step 5: Solve for x
    x = 433,409.17/904.45
  6. Step 6: Final answer
    x = 479.20

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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.