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Finding the Fourth Proportional to 39,985, 59,973.21 and 21,245.17

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Solution

The fourth proportional to 39,985, 59,973.21 and 21,245.17 is: 31,865.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,985 : 59,973.21 = 21,245.17 : x
  2. Step 2: Convert to fraction form
    39,985/59,973.21 = 21,245.17/x
  3. Step 3: Cross multiply
    39,985x = 59,973.21 × 21,245.17
  4. Step 4: Simplify right side
    39,985x = 1,274,141,041.90
  5. Step 5: Solve for x
    x = 1,274,141,041.90/39,985
  6. Step 6: Final answer
    x = 31,865.48

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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.