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Finding the Fourth Proportional to 42,796.80, 64,166.40 and 19,411.20

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Solution

The fourth proportional to 42,796.80, 64,166.40 and 19,411.20 is: 29,103.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,796.80 : 64,166.40 = 19,411.20 : x
  2. Step 2: Convert to fraction form
    42,796.80/64,166.40 = 19,411.20/x
  3. Step 3: Cross multiply
    42,796.80x = 64,166.40 × 19,411.20
  4. Step 4: Simplify right side
    42,796.80x = 1,245,546,823.68
  5. Step 5: Solve for x
    x = 1,245,546,823.68/42,796.80
  6. Step 6: Final answer
    x = 29,103.74

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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.