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Finding the Fourth Proportional to 1,240.69, 1,859.43 and 459.98

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Solution

The fourth proportional to 1,240.69, 1,859.43 and 459.98 is: 689.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.69 : 1,859.43 = 459.98 : x
  2. Step 2: Convert to fraction form
    1,240.69/1,859.43 = 459.98/x
  3. Step 3: Cross multiply
    1,240.69x = 1,859.43 × 459.98
  4. Step 4: Simplify right side
    1,240.69x = 855,298.72
  5. Step 5: Solve for x
    x = 855,298.72/1,240.69
  6. Step 6: Final answer
    x = 689.37

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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.