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Finding the Fourth Proportional to 28,646.61, 42,971.99 and 11,989.89

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Solution

The fourth proportional to 28,646.61, 42,971.99 and 11,989.89 is: 17,985.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,646.61 : 42,971.99 = 11,989.89 : x
  2. Step 2: Convert to fraction form
    28,646.61/42,971.99 = 11,989.89/x
  3. Step 3: Cross multiply
    28,646.61x = 42,971.99 × 11,989.89
  4. Step 4: Simplify right side
    28,646.61x = 515,229,433.18
  5. Step 5: Solve for x
    x = 515,229,433.18/28,646.61
  6. Step 6: Final answer
    x = 17,985.70

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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.