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Finding the Fourth Proportional to 42,876.87, 64,338.54 and 17,919.11

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Solution

The fourth proportional to 42,876.87, 64,338.54 and 17,919.11 is: 26,888.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,876.87 : 64,338.54 = 17,919.11 : x
  2. Step 2: Convert to fraction form
    42,876.87/64,338.54 = 17,919.11/x
  3. Step 3: Cross multiply
    42,876.87x = 64,338.54 × 17,919.11
  4. Step 4: Simplify right side
    42,876.87x = 1,152,889,536.35
  5. Step 5: Solve for x
    x = 1,152,889,536.35/42,876.87
  6. Step 6: Final answer
    x = 26,888.38

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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.