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Finding the Fourth Proportional to 1,239.47, 1,710.64 and 767.51

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Solution

The fourth proportional to 1,239.47, 1,710.64 and 767.51 is: 1,059.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.47 : 1,710.64 = 767.51 : x
  2. Step 2: Convert to fraction form
    1,239.47/1,710.64 = 767.51/x
  3. Step 3: Cross multiply
    1,239.47x = 1,710.64 × 767.51
  4. Step 4: Simplify right side
    1,239.47x = 1,312,929.47
  5. Step 5: Solve for x
    x = 1,312,929.47/1,239.47
  6. Step 6: Final answer
    x = 1,059.27

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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.