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Finding the Fourth Proportional to 61,430.60, 92,145.90 and 21,990.80

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Solution

The fourth proportional to 61,430.60, 92,145.90 and 21,990.80 is: 32,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,430.60 : 92,145.90 = 21,990.80 : x
  2. Step 2: Convert to fraction form
    61,430.60/92,145.90 = 21,990.80/x
  3. Step 3: Cross multiply
    61,430.60x = 92,145.90 × 21,990.80
  4. Step 4: Simplify right side
    61,430.60x = 2,026,362,057.72
  5. Step 5: Solve for x
    x = 2,026,362,057.72/61,430.60
  6. Step 6: Final answer
    x = 32,986.20

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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.