Home / 1,087.17-1,629.47-393.48

Finding the Fourth Proportional to 1,087.17, 1,629.47 and 393.48

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Solution

The fourth proportional to 1,087.17, 1,629.47 and 393.48 is: 589.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.17 : 1,629.47 = 393.48 : x
  2. Step 2: Convert to fraction form
    1,087.17/1,629.47 = 393.48/x
  3. Step 3: Cross multiply
    1,087.17x = 1,629.47 × 393.48
  4. Step 4: Simplify right side
    1,087.17x = 641,155.71
  5. Step 5: Solve for x
    x = 641,155.71/1,087.17
  6. Step 6: Final answer
    x = 589.75

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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.