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Finding the Fourth Proportional to 42,690, 64,052.01 and 21,618.66

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Solution

The fourth proportional to 42,690, 64,052.01 and 21,618.66 is: 32,436.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,690 : 64,052.01 = 21,618.66 : x
  2. Step 2: Convert to fraction form
    42,690/64,052.01 = 21,618.66/x
  3. Step 3: Cross multiply
    42,690x = 64,052.01 × 21,618.66
  4. Step 4: Simplify right side
    42,690x = 1,384,718,626.51
  5. Step 5: Solve for x
    x = 1,384,718,626.51/42,690
  6. Step 6: Final answer
    x = 32,436.60

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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.