Home / 28,319.15-42,386.28-20,820.72

Finding the Fourth Proportional to 28,319.15, 42,386.28 and 20,820.72

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Solution

The fourth proportional to 28,319.15, 42,386.28 and 20,820.72 is: 31,163.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,319.15 : 42,386.28 = 20,820.72 : x
  2. Step 2: Convert to fraction form
    28,319.15/42,386.28 = 20,820.72/x
  3. Step 3: Cross multiply
    28,319.15x = 42,386.28 × 20,820.72
  4. Step 4: Simplify right side
    28,319.15x = 882,512,867.72
  5. Step 5: Solve for x
    x = 882,512,867.72/28,319.15
  6. Step 6: Final answer
    x = 31,163.12

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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.