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Finding the Fourth Proportional to 9,966.90, 13,754.21 and 5,490.56

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Solution

The fourth proportional to 9,966.90, 13,754.21 and 5,490.56 is: 7,576.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,966.90 : 13,754.21 = 5,490.56 : x
  2. Step 2: Convert to fraction form
    9,966.90/13,754.21 = 5,490.56/x
  3. Step 3: Cross multiply
    9,966.90x = 13,754.21 × 5,490.56
  4. Step 4: Simplify right side
    9,966.90x = 75,518,283.51
  5. Step 5: Solve for x
    x = 75,518,283.51/9,966.90
  6. Step 6: Final answer
    x = 7,576.91

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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.