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Finding the Fourth Proportional to 20,750.53, 31,125.78 and 7,603.93

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Solution

The fourth proportional to 20,750.53, 31,125.78 and 7,603.93 is: 11,405.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,750.53 : 31,125.78 = 7,603.93 : x
  2. Step 2: Convert to fraction form
    20,750.53/31,125.78 = 7,603.93/x
  3. Step 3: Cross multiply
    20,750.53x = 31,125.78 × 7,603.93
  4. Step 4: Simplify right side
    20,750.53x = 236,678,252.32
  5. Step 5: Solve for x
    x = 236,678,252.32/20,750.53
  6. Step 6: Final answer
    x = 11,405.89

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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.