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Finding the Fourth Proportional to 15,321.40, 21,493.70 and 15,321.40

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Solution

The fourth proportional to 15,321.40, 21,493.70 and 15,321.40 is: 21,493.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.40 : 21,493.70 = 15,321.40 : x
  2. Step 2: Convert to fraction form
    15,321.40/21,493.70 = 15,321.40/x
  3. Step 3: Cross multiply
    15,321.40x = 21,493.70 × 15,321.40
  4. Step 4: Simplify right side
    15,321.40x = 329,313,575.18
  5. Step 5: Solve for x
    x = 329,313,575.18/15,321.40
  6. Step 6: Final answer
    x = 21,493.70

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Half scale
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Double scale
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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.