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Finding the Fourth Proportional to 1,239.65, 1,860.23 and 459.53

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Solution

The fourth proportional to 1,239.65, 1,860.23 and 459.53 is: 689.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.65 : 1,860.23 = 459.53 : x
  2. Step 2: Convert to fraction form
    1,239.65/1,860.23 = 459.53/x
  3. Step 3: Cross multiply
    1,239.65x = 1,860.23 × 459.53
  4. Step 4: Simplify right side
    1,239.65x = 854,819.89
  5. Step 5: Solve for x
    x = 854,819.89/1,239.65
  6. Step 6: Final answer
    x = 689.56

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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.