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Finding the Fourth Proportional to 21,059.87, 31,580.46 and 7,902.95

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Solution

The fourth proportional to 21,059.87, 31,580.46 and 7,902.95 is: 11,850.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,059.87 : 31,580.46 = 7,902.95 : x
  2. Step 2: Convert to fraction form
    21,059.87/31,580.46 = 7,902.95/x
  3. Step 3: Cross multiply
    21,059.87x = 31,580.46 × 7,902.95
  4. Step 4: Simplify right side
    21,059.87x = 249,578,638.45
  5. Step 5: Solve for x
    x = 249,578,638.45/21,059.87
  6. Step 6: Final answer
    x = 11,850.91

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1.5x scale

Why These Related Problems?

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