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Finding the Fourth Proportional to 42,987.63, 64,516.98 and 21,943.22

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Solution

The fourth proportional to 42,987.63, 64,516.98 and 21,943.22 is: 32,932.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,987.63 : 64,516.98 = 21,943.22 : x
  2. Step 2: Convert to fraction form
    42,987.63/64,516.98 = 21,943.22/x
  3. Step 3: Cross multiply
    42,987.63x = 64,516.98 × 21,943.22
  4. Step 4: Simplify right side
    42,987.63x = 1,415,710,285.88
  5. Step 5: Solve for x
    x = 1,415,710,285.88/42,987.63
  6. Step 6: Final answer
    x = 32,932.97

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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.