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Finding the Fourth Proportional to 12,990.78, 19,484.01 and 4,669.11

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Solution

The fourth proportional to 12,990.78, 19,484.01 and 4,669.11 is: 7,002.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.78 : 19,484.01 = 4,669.11 : x
  2. Step 2: Convert to fraction form
    12,990.78/19,484.01 = 4,669.11/x
  3. Step 3: Cross multiply
    12,990.78x = 19,484.01 × 4,669.11
  4. Step 4: Simplify right side
    12,990.78x = 90,972,985.93
  5. Step 5: Solve for x
    x = 90,972,985.93/12,990.78
  6. Step 6: Final answer
    x = 7,002.89

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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.