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Finding the Fourth Proportional to 5,418.72, 7,477.20 and 3,060.72

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Solution

The fourth proportional to 5,418.72, 7,477.20 and 3,060.72 is: 4,223.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.72 : 7,477.20 = 3,060.72 : x
  2. Step 2: Convert to fraction form
    5,418.72/7,477.20 = 3,060.72/x
  3. Step 3: Cross multiply
    5,418.72x = 7,477.20 × 3,060.72
  4. Step 4: Simplify right side
    5,418.72x = 22,885,615.58
  5. Step 5: Solve for x
    x = 22,885,615.58/5,418.72
  6. Step 6: Final answer
    x = 4,223.44

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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.