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Finding the Fourth Proportional to 7,978.48, 11,010.90 and 4,622.20

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Solution

The fourth proportional to 7,978.48, 11,010.90 and 4,622.20 is: 6,378.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.48 : 11,010.90 = 4,622.20 : x
  2. Step 2: Convert to fraction form
    7,978.48/11,010.90 = 4,622.20/x
  3. Step 3: Cross multiply
    7,978.48x = 11,010.90 × 4,622.20
  4. Step 4: Simplify right side
    7,978.48x = 50,894,581.98
  5. Step 5: Solve for x
    x = 50,894,581.98/7,978.48
  6. Step 6: Final answer
    x = 6,378.98

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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.