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Finding the Fourth Proportional to 61,220.20, 91,830.30 and 19,671.40

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Solution

The fourth proportional to 61,220.20, 91,830.30 and 19,671.40 is: 29,507.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,220.20 : 91,830.30 = 19,671.40 : x
  2. Step 2: Convert to fraction form
    61,220.20/91,830.30 = 19,671.40/x
  3. Step 3: Cross multiply
    61,220.20x = 91,830.30 × 19,671.40
  4. Step 4: Simplify right side
    61,220.20x = 1,806,430,563.42
  5. Step 5: Solve for x
    x = 1,806,430,563.42/61,220.20
  6. Step 6: Final answer
    x = 29,507.10

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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.