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Finding the Fourth Proportional to 85,377.69, 128,048.20 and 25,391.72

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Solution

The fourth proportional to 85,377.69, 128,048.20 and 25,391.72 is: 38,082.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,377.69 : 128,048.20 = 25,391.72 : x
  2. Step 2: Convert to fraction form
    85,377.69/128,048.20 = 25,391.72/x
  3. Step 3: Cross multiply
    85,377.69x = 128,048.20 × 25,391.72
  4. Step 4: Simplify right side
    85,377.69x = 3,251,364,297.55
  5. Step 5: Solve for x
    x = 3,251,364,297.55/85,377.69
  6. Step 6: Final answer
    x = 38,082.13

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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.