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Finding the Fourth Proportional to 21,643.56, 29,868.18 and 11,707.56

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Solution

The fourth proportional to 21,643.56, 29,868.18 and 11,707.56 is: 16,156.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,643.56 : 29,868.18 = 11,707.56 : x
  2. Step 2: Convert to fraction form
    21,643.56/29,868.18 = 11,707.56/x
  3. Step 3: Cross multiply
    21,643.56x = 29,868.18 × 11,707.56
  4. Step 4: Simplify right side
    21,643.56x = 349,683,509.44
  5. Step 5: Solve for x
    x = 349,683,509.44/21,643.56
  6. Step 6: Final answer
    x = 16,156.47

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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.