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Finding the Fourth Proportional to 90,920, 136,384.86 and 28,595.36

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Solution

The fourth proportional to 90,920, 136,384.86 and 28,595.36 is: 42,894.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,920 : 136,384.86 = 28,595.36 : x
  2. Step 2: Convert to fraction form
    90,920/136,384.86 = 28,595.36/x
  3. Step 3: Cross multiply
    90,920x = 136,384.86 × 28,595.36
  4. Step 4: Simplify right side
    90,920x = 3,899,974,170.25
  5. Step 5: Solve for x
    x = 3,899,974,170.25/90,920
  6. Step 6: Final answer
    x = 42,894.57

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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.