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Finding the Fourth Proportional to 90,620.61, 125,013.04 and 63,778.01

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Solution

The fourth proportional to 90,620.61, 125,013.04 and 63,778.01 is: 87,983.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,620.61 : 125,013.04 = 63,778.01 : x
  2. Step 2: Convert to fraction form
    90,620.61/125,013.04 = 63,778.01/x
  3. Step 3: Cross multiply
    90,620.61x = 125,013.04 × 63,778.01
  4. Step 4: Simplify right side
    90,620.61x = 7,973,082,915.25
  5. Step 5: Solve for x
    x = 7,973,082,915.25/90,620.61
  6. Step 6: Final answer
    x = 87,983.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.