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Finding the Fourth Proportional to 39,985.90, 59,978.93 and 10,403.69

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Solution

The fourth proportional to 39,985.90, 59,978.93 and 10,403.69 is: 15,605.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,985.90 : 59,978.93 = 10,403.69 : x
  2. Step 2: Convert to fraction form
    39,985.90/59,978.93 = 10,403.69/x
  3. Step 3: Cross multiply
    39,985.90x = 59,978.93 × 10,403.69
  4. Step 4: Simplify right side
    39,985.90x = 624,002,194.25
  5. Step 5: Solve for x
    x = 624,002,194.25/39,985.90
  6. Step 6: Final answer
    x = 15,605.56

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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.