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Finding the Fourth Proportional to 1,040.79, 1,560.72 and 310.20

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Solution

The fourth proportional to 1,040.79, 1,560.72 and 310.20 is: 465.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.79 : 1,560.72 = 310.20 : x
  2. Step 2: Convert to fraction form
    1,040.79/1,560.72 = 310.20/x
  3. Step 3: Cross multiply
    1,040.79x = 1,560.72 × 310.20
  4. Step 4: Simplify right side
    1,040.79x = 484,135.34
  5. Step 5: Solve for x
    x = 484,135.34/1,040.79
  6. Step 6: Final answer
    x = 465.16

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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.