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Finding the Fourth Proportional to 21,458.80, 29,615.16 and 12,505.60

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Solution

The fourth proportional to 21,458.80, 29,615.16 and 12,505.60 is: 17,258.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,458.80 : 29,615.16 = 12,505.60 : x
  2. Step 2: Convert to fraction form
    21,458.80/29,615.16 = 12,505.60/x
  3. Step 3: Cross multiply
    21,458.80x = 29,615.16 × 12,505.60
  4. Step 4: Simplify right side
    21,458.80x = 370,355,344.90
  5. Step 5: Solve for x
    x = 370,355,344.90/21,458.80
  6. Step 6: Final answer
    x = 17,258.90

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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.