Home / 1,140.12-1,574.42-1,078.74

Finding the Fourth Proportional to 1,140.12, 1,574.42 and 1,078.74

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Solution

The fourth proportional to 1,140.12, 1,574.42 and 1,078.74 is: 1,489.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.12 : 1,574.42 = 1,078.74 : x
  2. Step 2: Convert to fraction form
    1,140.12/1,574.42 = 1,078.74/x
  3. Step 3: Cross multiply
    1,140.12x = 1,574.42 × 1,078.74
  4. Step 4: Simplify right side
    1,140.12x = 1,698,384.44
  5. Step 5: Solve for x
    x = 1,698,384.44/1,140.12
  6. Step 6: Final answer
    x = 1,489.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.