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Finding the Fourth Proportional to 3,988.56, 5,506.56 and 2,666.64

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Solution

The fourth proportional to 3,988.56, 5,506.56 and 2,666.64 is: 3,681.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.56 : 5,506.56 = 2,666.64 : x
  2. Step 2: Convert to fraction form
    3,988.56/5,506.56 = 2,666.64/x
  3. Step 3: Cross multiply
    3,988.56x = 5,506.56 × 2,666.64
  4. Step 4: Simplify right side
    3,988.56x = 14,684,013.16
  5. Step 5: Solve for x
    x = 14,684,013.16/3,988.56
  6. Step 6: Final answer
    x = 3,681.53

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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.