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Finding the Fourth Proportional to 8,690.78, 11,994.93 and 5,155.94

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Solution

The fourth proportional to 8,690.78, 11,994.93 and 5,155.94 is: 7,116.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.78 : 11,994.93 = 5,155.94 : x
  2. Step 2: Convert to fraction form
    8,690.78/11,994.93 = 5,155.94/x
  3. Step 3: Cross multiply
    8,690.78x = 11,994.93 × 5,155.94
  4. Step 4: Simplify right side
    8,690.78x = 61,845,139.38
  5. Step 5: Solve for x
    x = 61,845,139.38/8,690.78
  6. Step 6: Final answer
    x = 7,116.18

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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.