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Finding the Fourth Proportional to 19,997.70, 28,055.10 and 19,997.70

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Solution

The fourth proportional to 19,997.70, 28,055.10 and 19,997.70 is: 28,055.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,997.70 : 28,055.10 = 19,997.70 : x
  2. Step 2: Convert to fraction form
    19,997.70/28,055.10 = 19,997.70/x
  3. Step 3: Cross multiply
    19,997.70x = 28,055.10 × 19,997.70
  4. Step 4: Simplify right side
    19,997.70x = 561,037,473.27
  5. Step 5: Solve for x
    x = 561,037,473.27/19,997.70
  6. Step 6: Final answer
    x = 28,055.10

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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.