Home / 20,988.20-31,328.74-18,497.15

Finding the Fourth Proportional to 20,988.20, 31,328.74 and 18,497.15

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Solution

The fourth proportional to 20,988.20, 31,328.74 and 18,497.15 is: 27,610.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.20 : 31,328.74 = 18,497.15 : x
  2. Step 2: Convert to fraction form
    20,988.20/31,328.74 = 18,497.15/x
  3. Step 3: Cross multiply
    20,988.20x = 31,328.74 × 18,497.15
  4. Step 4: Simplify right side
    20,988.20x = 579,492,200.20
  5. Step 5: Solve for x
    x = 579,492,200.20/20,988.20
  6. Step 6: Final answer
    x = 27,610.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.