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Finding the Fourth Proportional to 9,381.84, 12,918.60 and 8,899.92

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Solution

The fourth proportional to 9,381.84, 12,918.60 and 8,899.92 is: 12,255.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,381.84 : 12,918.60 = 8,899.92 : x
  2. Step 2: Convert to fraction form
    9,381.84/12,918.60 = 8,899.92/x
  3. Step 3: Cross multiply
    9,381.84x = 12,918.60 × 8,899.92
  4. Step 4: Simplify right side
    9,381.84x = 114,974,506.51
  5. Step 5: Solve for x
    x = 114,974,506.51/9,381.84
  6. Step 6: Final answer
    x = 12,255.01

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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.