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Finding the Fourth Proportional to 15,211.40, 21,347.80 and 15,211.40

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Solution

The fourth proportional to 15,211.40, 21,347.80 and 15,211.40 is: 21,347.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.40 : 21,347.80 = 15,211.40 : x
  2. Step 2: Convert to fraction form
    15,211.40/21,347.80 = 15,211.40/x
  3. Step 3: Cross multiply
    15,211.40x = 21,347.80 × 15,211.40
  4. Step 4: Simplify right side
    15,211.40x = 324,729,924.92
  5. Step 5: Solve for x
    x = 324,729,924.92/15,211.40
  6. Step 6: Final answer
    x = 21,347.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.