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Finding the Fourth Proportional to 61,438.80, 92,158.20 and 19,885.80

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Solution

The fourth proportional to 61,438.80, 92,158.20 and 19,885.80 is: 29,828.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,438.80 : 92,158.20 = 19,885.80 : x
  2. Step 2: Convert to fraction form
    61,438.80/92,158.20 = 19,885.80/x
  3. Step 3: Cross multiply
    61,438.80x = 92,158.20 × 19,885.80
  4. Step 4: Simplify right side
    61,438.80x = 1,832,639,533.56
  5. Step 5: Solve for x
    x = 1,832,639,533.56/61,438.80
  6. Step 6: Final answer
    x = 29,828.70

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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.