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Finding the Fourth Proportional to 7,876.53, 11,771.28 and 7,421.31

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Solution

The fourth proportional to 7,876.53, 11,771.28 and 7,421.31 is: 11,090.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,876.53 : 11,771.28 = 7,421.31 : x
  2. Step 2: Convert to fraction form
    7,876.53/11,771.28 = 7,421.31/x
  3. Step 3: Cross multiply
    7,876.53x = 11,771.28 × 7,421.31
  4. Step 4: Simplify right side
    7,876.53x = 87,358,317.98
  5. Step 5: Solve for x
    x = 87,358,317.98/7,876.53
  6. Step 6: Final answer
    x = 11,090.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.