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Finding the Fourth Proportional to 1,386.07, 2,080.01 and 520.38

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Solution

The fourth proportional to 1,386.07, 2,080.01 and 520.38 is: 780.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.07 : 2,080.01 = 520.38 : x
  2. Step 2: Convert to fraction form
    1,386.07/2,080.01 = 520.38/x
  3. Step 3: Cross multiply
    1,386.07x = 2,080.01 × 520.38
  4. Step 4: Simplify right side
    1,386.07x = 1,082,395.60
  5. Step 5: Solve for x
    x = 1,082,395.60/1,386.07
  6. Step 6: Final answer
    x = 780.91

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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.