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Finding the Fourth Proportional to 7,980.88, 11,012.08 and 5,147.71

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Solution

The fourth proportional to 7,980.88, 11,012.08 and 5,147.71 is: 7,102.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.88 : 11,012.08 = 5,147.71 : x
  2. Step 2: Convert to fraction form
    7,980.88/11,012.08 = 5,147.71/x
  3. Step 3: Cross multiply
    7,980.88x = 11,012.08 × 5,147.71
  4. Step 4: Simplify right side
    7,980.88x = 56,686,994.34
  5. Step 5: Solve for x
    x = 56,686,994.34/7,980.88
  6. Step 6: Final answer
    x = 7,102.85

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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.