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Finding the Fourth Proportional to 7,755.75, 10,702.47 and 4,218.93

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Solution

The fourth proportional to 7,755.75, 10,702.47 and 4,218.93 is: 5,821.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,755.75 : 10,702.47 = 4,218.93 : x
  2. Step 2: Convert to fraction form
    7,755.75/10,702.47 = 4,218.93/x
  3. Step 3: Cross multiply
    7,755.75x = 10,702.47 × 4,218.93
  4. Step 4: Simplify right side
    7,755.75x = 45,152,971.76
  5. Step 5: Solve for x
    x = 45,152,971.76/7,755.75
  6. Step 6: Final answer
    x = 5,821.87

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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.