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Finding the Fourth Proportional to 1,040.65, 1,561.28 and 607.50

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Solution

The fourth proportional to 1,040.65, 1,561.28 and 607.50 is: 911.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.65 : 1,561.28 = 607.50 : x
  2. Step 2: Convert to fraction form
    1,040.65/1,561.28 = 607.50/x
  3. Step 3: Cross multiply
    1,040.65x = 1,561.28 × 607.50
  4. Step 4: Simplify right side
    1,040.65x = 948,474.56
  5. Step 5: Solve for x
    x = 948,474.56/1,040.65
  6. Step 6: Final answer
    x = 911.43

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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.