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Finding the Fourth Proportional to 1,239.84, 1,860.75 and 655.47

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Solution

The fourth proportional to 1,239.84, 1,860.75 and 655.47 is: 983.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.84 : 1,860.75 = 655.47 : x
  2. Step 2: Convert to fraction form
    1,239.84/1,860.75 = 655.47/x
  3. Step 3: Cross multiply
    1,239.84x = 1,860.75 × 655.47
  4. Step 4: Simplify right side
    1,239.84x = 1,219,665.80
  5. Step 5: Solve for x
    x = 1,219,665.80/1,239.84
  6. Step 6: Final answer
    x = 983.73

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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.