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Finding the Fourth Proportional to 7,490.70, 11,218.53 and 5,920.16

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Solution

The fourth proportional to 7,490.70, 11,218.53 and 5,920.16 is: 8,866.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,490.70 : 11,218.53 = 5,920.16 : x
  2. Step 2: Convert to fraction form
    7,490.70/11,218.53 = 5,920.16/x
  3. Step 3: Cross multiply
    7,490.70x = 11,218.53 × 5,920.16
  4. Step 4: Simplify right side
    7,490.70x = 66,415,520.61
  5. Step 5: Solve for x
    x = 66,415,520.61/7,490.70
  6. Step 6: Final answer
    x = 8,866.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.