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Finding the Fourth Proportional to 125,978.20, 188,967.30 and 90,548.80

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Solution

The fourth proportional to 125,978.20, 188,967.30 and 90,548.80 is: 135,823.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,978.20 : 188,967.30 = 90,548.80 : x
  2. Step 2: Convert to fraction form
    125,978.20/188,967.30 = 90,548.80/x
  3. Step 3: Cross multiply
    125,978.20x = 188,967.30 × 90,548.80
  4. Step 4: Simplify right side
    125,978.20x = 17,110,762,254.24
  5. Step 5: Solve for x
    x = 17,110,762,254.24/125,978.20
  6. Step 6: Final answer
    x = 135,823.20

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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.