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Finding the Fourth Proportional to 7,185.84, 9,916.14 and 3,999.30

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Solution

The fourth proportional to 7,185.84, 9,916.14 and 3,999.30 is: 5,518.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,185.84 : 9,916.14 = 3,999.30 : x
  2. Step 2: Convert to fraction form
    7,185.84/9,916.14 = 3,999.30/x
  3. Step 3: Cross multiply
    7,185.84x = 9,916.14 × 3,999.30
  4. Step 4: Simplify right side
    7,185.84x = 39,657,618.70
  5. Step 5: Solve for x
    x = 39,657,618.70/7,185.84
  6. Step 6: Final answer
    x = 5,518.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.