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Finding the Fourth Proportional to 1,386.70, 2,080.05 and 617.20

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Solution

The fourth proportional to 1,386.70, 2,080.05 and 617.20 is: 925.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.70 : 2,080.05 = 617.20 : x
  2. Step 2: Convert to fraction form
    1,386.70/2,080.05 = 617.20/x
  3. Step 3: Cross multiply
    1,386.70x = 2,080.05 × 617.20
  4. Step 4: Simplify right side
    1,386.70x = 1,283,806.86
  5. Step 5: Solve for x
    x = 1,283,806.86/1,386.70
  6. Step 6: Final answer
    x = 925.80

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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.