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Finding the Fourth Proportional to 21,639.76, 29,862.84 and 11,703.76

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Solution

The fourth proportional to 21,639.76, 29,862.84 and 11,703.76 is: 16,151.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639.76 : 29,862.84 = 11,703.76 : x
  2. Step 2: Convert to fraction form
    21,639.76/29,862.84 = 11,703.76/x
  3. Step 3: Cross multiply
    21,639.76x = 29,862.84 × 11,703.76
  4. Step 4: Simplify right side
    21,639.76x = 349,507,512.28
  5. Step 5: Solve for x
    x = 349,507,512.28/21,639.76
  6. Step 6: Final answer
    x = 16,151.17

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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.