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Finding the Fourth Proportional to 78,021.40, 117,060.90 and 25,432.60

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Solution

The fourth proportional to 78,021.40, 117,060.90 and 25,432.60 is: 38,158.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,021.40 : 117,060.90 = 25,432.60 : x
  2. Step 2: Convert to fraction form
    78,021.40/117,060.90 = 25,432.60/x
  3. Step 3: Cross multiply
    78,021.40x = 117,060.90 × 25,432.60
  4. Step 4: Simplify right side
    78,021.40x = 2,977,163,045.34
  5. Step 5: Solve for x
    x = 2,977,163,045.34/78,021.40
  6. Step 6: Final answer
    x = 38,158.29

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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.