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Finding the Fourth Proportional to 21,005.36, 28,981.19 and 12,503.19

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Solution

The fourth proportional to 21,005.36, 28,981.19 and 12,503.19 is: 17,250.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.36 : 28,981.19 = 12,503.19 : x
  2. Step 2: Convert to fraction form
    21,005.36/28,981.19 = 12,503.19/x
  3. Step 3: Cross multiply
    21,005.36x = 28,981.19 × 12,503.19
  4. Step 4: Simplify right side
    21,005.36x = 362,357,464.93
  5. Step 5: Solve for x
    x = 362,357,464.93/21,005.36
  6. Step 6: Final answer
    x = 17,250.72

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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.