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Finding the Fourth Proportional to 1,386.68, 2,080.74 and 617

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Solution

The fourth proportional to 1,386.68, 2,080.74 and 617 is: 925.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.68 : 2,080.74 = 617 : x
  2. Step 2: Convert to fraction form
    1,386.68/2,080.74 = 617/x
  3. Step 3: Cross multiply
    1,386.68x = 2,080.74 × 617
  4. Step 4: Simplify right side
    1,386.68x = 1,283,816.58
  5. Step 5: Solve for x
    x = 1,283,816.58/1,386.68
  6. Step 6: Final answer
    x = 925.82

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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.