Home / 3,987.40-5,981.73-1,318.18

Finding the Fourth Proportional to 3,987.40, 5,981.73 and 1,318.18

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Solution

The fourth proportional to 3,987.40, 5,981.73 and 1,318.18 is: 1,977.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.40 : 5,981.73 = 1,318.18 : x
  2. Step 2: Convert to fraction form
    3,987.40/5,981.73 = 1,318.18/x
  3. Step 3: Cross multiply
    3,987.40x = 5,981.73 × 1,318.18
  4. Step 4: Simplify right side
    3,987.40x = 7,884,960.35
  5. Step 5: Solve for x
    x = 7,884,960.35/3,987.40
  6. Step 6: Final answer
    x = 1,977.47

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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.