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Finding the Fourth Proportional to 1,386.54, 2,078.73 and 655.47

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Solution

The fourth proportional to 1,386.54, 2,078.73 and 655.47 is: 982.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.54 : 2,078.73 = 655.47 : x
  2. Step 2: Convert to fraction form
    1,386.54/2,078.73 = 655.47/x
  3. Step 3: Cross multiply
    1,386.54x = 2,078.73 × 655.47
  4. Step 4: Simplify right side
    1,386.54x = 1,362,545.15
  5. Step 5: Solve for x
    x = 1,362,545.15/1,386.54
  6. Step 6: Final answer
    x = 982.69

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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.