Home / 21,005.32-28,981.12-12,500.63

Finding the Fourth Proportional to 21,005.32, 28,981.12 and 12,500.63

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Solution

The fourth proportional to 21,005.32, 28,981.12 and 12,500.63 is: 17,247.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.32 : 28,981.12 = 12,500.63 : x
  2. Step 2: Convert to fraction form
    21,005.32/28,981.12 = 12,500.63/x
  3. Step 3: Cross multiply
    21,005.32x = 28,981.12 × 12,500.63
  4. Step 4: Simplify right side
    21,005.32x = 362,282,258.11
  5. Step 5: Solve for x
    x = 362,282,258.11/21,005.32
  6. Step 6: Final answer
    x = 17,247.17

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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.