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Finding the Fourth Proportional to 15,919.12, 21,918.04 and 12,130.12

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Solution

The fourth proportional to 15,919.12, 21,918.04 and 12,130.12 is: 16,701.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,919.12 : 21,918.04 = 12,130.12 : x
  2. Step 2: Convert to fraction form
    15,919.12/21,918.04 = 12,130.12/x
  3. Step 3: Cross multiply
    15,919.12x = 21,918.04 × 12,130.12
  4. Step 4: Simplify right side
    15,919.12x = 265,868,455.36
  5. Step 5: Solve for x
    x = 265,868,455.36/15,919.12
  6. Step 6: Final answer
    x = 16,701.20

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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.