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Finding the Fourth Proportional to 1,240.48, 1,860.90 and 407.26

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Solution

The fourth proportional to 1,240.48, 1,860.90 and 407.26 is: 610.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.48 : 1,860.90 = 407.26 : x
  2. Step 2: Convert to fraction form
    1,240.48/1,860.90 = 407.26/x
  3. Step 3: Cross multiply
    1,240.48x = 1,860.90 × 407.26
  4. Step 4: Simplify right side
    1,240.48x = 757,870.13
  5. Step 5: Solve for x
    x = 757,870.13/1,240.48
  6. Step 6: Final answer
    x = 610.95

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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.