Home / 80,721.63-121,082.90-28,130.85

Finding the Fourth Proportional to 80,721.63, 121,082.90 and 28,130.85

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Solution

The fourth proportional to 80,721.63, 121,082.90 and 28,130.85 is: 42,196.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,721.63 : 121,082.90 = 28,130.85 : x
  2. Step 2: Convert to fraction form
    80,721.63/121,082.90 = 28,130.85/x
  3. Step 3: Cross multiply
    80,721.63x = 121,082.90 × 28,130.85
  4. Step 4: Simplify right side
    80,721.63x = 3,406,164,756.81
  5. Step 5: Solve for x
    x = 3,406,164,756.81/80,721.63
  6. Step 6: Final answer
    x = 42,196.43

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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.