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Finding the Fourth Proportional to 20,368.89, 30,553.47 and 7,890.30

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Solution

The fourth proportional to 20,368.89, 30,553.47 and 7,890.30 is: 11,835.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,368.89 : 30,553.47 = 7,890.30 : x
  2. Step 2: Convert to fraction form
    20,368.89/30,553.47 = 7,890.30/x
  3. Step 3: Cross multiply
    20,368.89x = 30,553.47 × 7,890.30
  4. Step 4: Simplify right side
    20,368.89x = 241,076,044.34
  5. Step 5: Solve for x
    x = 241,076,044.34/20,368.89
  6. Step 6: Final answer
    x = 11,835.50

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Double scale
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Similar ratio
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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.