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Finding the Fourth Proportional to 41,985.40, 62,978.64 and 12,403.68

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Solution

The fourth proportional to 41,985.40, 62,978.64 and 12,403.68 is: 18,605.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    41,985.40 : 62,978.64 = 12,403.68 : x
  2. Step 2: Convert to fraction form
    41,985.40/62,978.64 = 12,403.68/x
  3. Step 3: Cross multiply
    41,985.40x = 62,978.64 × 12,403.68
  4. Step 4: Simplify right side
    41,985.40x = 781,166,897.40
  5. Step 5: Solve for x
    x = 781,166,897.40/41,985.40
  6. Step 6: Final answer
    x = 18,605.68

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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.