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Finding the Fourth Proportional to 1,386.15, 2,080.23 and 655.93

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Solution

The fourth proportional to 1,386.15, 2,080.23 and 655.93 is: 984.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.15 : 2,080.23 = 655.93 : x
  2. Step 2: Convert to fraction form
    1,386.15/2,080.23 = 655.93/x
  3. Step 3: Cross multiply
    1,386.15x = 2,080.23 × 655.93
  4. Step 4: Simplify right side
    1,386.15x = 1,364,485.26
  5. Step 5: Solve for x
    x = 1,364,485.26/1,386.15
  6. Step 6: Final answer
    x = 984.37

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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.