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Finding the Fourth Proportional to 901.93, 1,352.40 and 316.78

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Solution

The fourth proportional to 901.93, 1,352.40 and 316.78 is: 474.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.93 : 1,352.40 = 316.78 : x
  2. Step 2: Convert to fraction form
    901.93/1,352.40 = 316.78/x
  3. Step 3: Cross multiply
    901.93x = 1,352.40 × 316.78
  4. Step 4: Simplify right side
    901.93x = 428,409.89
  5. Step 5: Solve for x
    x = 428,409.89/901.93
  6. Step 6: Final answer
    x = 474.99

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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.