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Finding the Fourth Proportional to 1,040.30, 1,560.76 and 309.90

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Solution

The fourth proportional to 1,040.30, 1,560.76 and 309.90 is: 464.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.30 : 1,560.76 = 309.90 : x
  2. Step 2: Convert to fraction form
    1,040.30/1,560.76 = 309.90/x
  3. Step 3: Cross multiply
    1,040.30x = 1,560.76 × 309.90
  4. Step 4: Simplify right side
    1,040.30x = 483,679.52
  5. Step 5: Solve for x
    x = 483,679.52/1,040.30
  6. Step 6: Final answer
    x = 464.94

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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.