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Finding the Fourth Proportional to 1,040.53, 1,561.09 and 347.65

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Solution

The fourth proportional to 1,040.53, 1,561.09 and 347.65 is: 521.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.53 : 1,561.09 = 347.65 : x
  2. Step 2: Convert to fraction form
    1,040.53/1,561.09 = 347.65/x
  3. Step 3: Cross multiply
    1,040.53x = 1,561.09 × 347.65
  4. Step 4: Simplify right side
    1,040.53x = 542,703.39
  5. Step 5: Solve for x
    x = 542,703.39/1,040.53
  6. Step 6: Final answer
    x = 521.57

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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.