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Finding the Fourth Proportional to 1,387.07, 2,080.71 and 693.28

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Solution

The fourth proportional to 1,387.07, 2,080.71 and 693.28 is: 1,039.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.07 : 2,080.71 = 693.28 : x
  2. Step 2: Convert to fraction form
    1,387.07/2,080.71 = 693.28/x
  3. Step 3: Cross multiply
    1,387.07x = 2,080.71 × 693.28
  4. Step 4: Simplify right side
    1,387.07x = 1,442,509.43
  5. Step 5: Solve for x
    x = 1,442,509.43/1,387.07
  6. Step 6: Final answer
    x = 1,039.97

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1.5x scale

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.