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Finding the Fourth Proportional to 21,059.40, 31,573.20 and 12,737.64

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Solution

The fourth proportional to 21,059.40, 31,573.20 and 12,737.64 is: 19,096.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,059.40 : 31,573.20 = 12,737.64 : x
  2. Step 2: Convert to fraction form
    21,059.40/31,573.20 = 12,737.64/x
  3. Step 3: Cross multiply
    21,059.40x = 31,573.20 × 12,737.64
  4. Step 4: Simplify right side
    21,059.40x = 402,168,055.25
  5. Step 5: Solve for x
    x = 402,168,055.25/21,059.40
  6. Step 6: Final answer
    x = 19,096.84

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.