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Finding the Fourth Proportional to 1,386.13, 2,078.39 and 655.70

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Solution

The fourth proportional to 1,386.13, 2,078.39 and 655.70 is: 983.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.13 : 2,078.39 = 655.70 : x
  2. Step 2: Convert to fraction form
    1,386.13/2,078.39 = 655.70/x
  3. Step 3: Cross multiply
    1,386.13x = 2,078.39 × 655.70
  4. Step 4: Simplify right side
    1,386.13x = 1,362,803.34
  5. Step 5: Solve for x
    x = 1,362,803.34/1,386.13
  6. Step 6: Final answer
    x = 983.17

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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.