Home / 18,386.40-27,564.12-7,990.32

Finding the Fourth Proportional to 18,386.40, 27,564.12 and 7,990.32

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Solution

The fourth proportional to 18,386.40, 27,564.12 and 7,990.32 is: 11,978.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,386.40 : 27,564.12 = 7,990.32 : x
  2. Step 2: Convert to fraction form
    18,386.40/27,564.12 = 7,990.32/x
  3. Step 3: Cross multiply
    18,386.40x = 27,564.12 × 7,990.32
  4. Step 4: Simplify right side
    18,386.40x = 220,246,139.32
  5. Step 5: Solve for x
    x = 220,246,139.32/18,386.40
  6. Step 6: Final answer
    x = 11,978.75

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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.