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Finding the Fourth Proportional to 1,239.65, 1,710.71 and 680.13

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Solution

The fourth proportional to 1,239.65, 1,710.71 and 680.13 is: 938.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.65 : 1,710.71 = 680.13 : x
  2. Step 2: Convert to fraction form
    1,239.65/1,710.71 = 680.13/x
  3. Step 3: Cross multiply
    1,239.65x = 1,710.71 × 680.13
  4. Step 4: Simplify right side
    1,239.65x = 1,163,501.79
  5. Step 5: Solve for x
    x = 1,163,501.79/1,239.65
  6. Step 6: Final answer
    x = 938.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.