Home / 13,312.78-19,971.28-4,991.66

Finding the Fourth Proportional to 13,312.78, 19,971.28 and 4,991.66

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Solution

The fourth proportional to 13,312.78, 19,971.28 and 4,991.66 is: 7,488.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,312.78 : 19,971.28 = 4,991.66 : x
  2. Step 2: Convert to fraction form
    13,312.78/19,971.28 = 4,991.66/x
  3. Step 3: Cross multiply
    13,312.78x = 19,971.28 × 4,991.66
  4. Step 4: Simplify right side
    13,312.78x = 99,689,839.52
  5. Step 5: Solve for x
    x = 99,689,839.52/13,312.78
  6. Step 6: Final answer
    x = 7,488.28

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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.