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Finding the Fourth Proportional to 21,069.70, 31,592.40 and 7,923.40

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Solution

The fourth proportional to 21,069.70, 31,592.40 and 7,923.40 is: 11,880.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,069.70 : 31,592.40 = 7,923.40 : x
  2. Step 2: Convert to fraction form
    21,069.70/31,592.40 = 7,923.40/x
  3. Step 3: Cross multiply
    21,069.70x = 31,592.40 × 7,923.40
  4. Step 4: Simplify right side
    21,069.70x = 250,319,222.16
  5. Step 5: Solve for x
    x = 250,319,222.16/21,069.70
  6. Step 6: Final answer
    x = 11,880.53

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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.