Home / 28,275.76-42,373.56-20,821.72

Finding the Fourth Proportional to 28,275.76, 42,373.56 and 20,821.72

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Solution

The fourth proportional to 28,275.76, 42,373.56 and 20,821.72 is: 31,203.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,275.76 : 42,373.56 = 20,821.72 : x
  2. Step 2: Convert to fraction form
    28,275.76/42,373.56 = 20,821.72/x
  3. Step 3: Cross multiply
    28,275.76x = 42,373.56 × 20,821.72
  4. Step 4: Simplify right side
    28,275.76x = 882,290,401.72
  5. Step 5: Solve for x
    x = 882,290,401.72/28,275.76
  6. Step 6: Final answer
    x = 31,203.07

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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.