Home / 21,030.28-31,508.30-18,742.12

Finding the Fourth Proportional to 21,030.28, 31,508.30 and 18,742.12

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Solution

The fourth proportional to 21,030.28, 31,508.30 and 18,742.12 is: 28,080.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,030.28 : 31,508.30 = 18,742.12 : x
  2. Step 2: Convert to fraction form
    21,030.28/31,508.30 = 18,742.12/x
  3. Step 3: Cross multiply
    21,030.28x = 31,508.30 × 18,742.12
  4. Step 4: Simplify right side
    21,030.28x = 590,532,339.60
  5. Step 5: Solve for x
    x = 590,532,339.60/21,030.28
  6. Step 6: Final answer
    x = 28,080.10

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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.