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Finding the Fourth Proportional to 5,377.89, 7,421.21 and 2,987.99

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Solution

The fourth proportional to 5,377.89, 7,421.21 and 2,987.99 is: 4,123.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,377.89 : 7,421.21 = 2,987.99 : x
  2. Step 2: Convert to fraction form
    5,377.89/7,421.21 = 2,987.99/x
  3. Step 3: Cross multiply
    5,377.89x = 7,421.21 × 2,987.99
  4. Step 4: Simplify right side
    5,377.89x = 22,174,504.88
  5. Step 5: Solve for x
    x = 22,174,504.88/5,377.89
  6. Step 6: Final answer
    x = 4,123.28

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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.