Home / 31,031.52-42,820.28-18,111.20

Finding the Fourth Proportional to 31,031.52, 42,820.28 and 18,111.20

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Solution

The fourth proportional to 31,031.52, 42,820.28 and 18,111.20 is: 24,991.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,031.52 : 42,820.28 = 18,111.20 : x
  2. Step 2: Convert to fraction form
    31,031.52/42,820.28 = 18,111.20/x
  3. Step 3: Cross multiply
    31,031.52x = 42,820.28 × 18,111.20
  4. Step 4: Simplify right side
    31,031.52x = 775,526,655.14
  5. Step 5: Solve for x
    x = 775,526,655.14/31,031.52
  6. Step 6: Final answer
    x = 24,991.58

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1.5x scale

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.