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Finding the Fourth Proportional to 21,458.49, 29,611.49 and 12,507.45

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Solution

The fourth proportional to 21,458.49, 29,611.49 and 12,507.45 is: 17,259.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,458.49 : 29,611.49 = 12,507.45 : x
  2. Step 2: Convert to fraction form
    21,458.49/29,611.49 = 12,507.45/x
  3. Step 3: Cross multiply
    21,458.49x = 29,611.49 × 12,507.45
  4. Step 4: Simplify right side
    21,458.49x = 370,364,168.06
  5. Step 5: Solve for x
    x = 370,364,168.06/21,458.49
  6. Step 6: Final answer
    x = 17,259.56

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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.