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Finding the Fourth Proportional to 1,561.26, 2,342.02 and 407

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Solution

The fourth proportional to 1,561.26, 2,342.02 and 407 is: 610.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.26 : 2,342.02 = 407 : x
  2. Step 2: Convert to fraction form
    1,561.26/2,342.02 = 407/x
  3. Step 3: Cross multiply
    1,561.26x = 2,342.02 × 407
  4. Step 4: Simplify right side
    1,561.26x = 953,202.14
  5. Step 5: Solve for x
    x = 953,202.14/1,561.26
  6. Step 6: Final answer
    x = 610.53

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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.