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Finding the Fourth Proportional to 28,707.75, 43,062.43 and 7,931.25

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Solution

The fourth proportional to 28,707.75, 43,062.43 and 7,931.25 is: 11,897.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,707.75 : 43,062.43 = 7,931.25 : x
  2. Step 2: Convert to fraction form
    28,707.75/43,062.43 = 7,931.25/x
  3. Step 3: Cross multiply
    28,707.75x = 43,062.43 × 7,931.25
  4. Step 4: Simplify right side
    28,707.75x = 341,538,897.94
  5. Step 5: Solve for x
    x = 341,538,897.94/28,707.75
  6. Step 6: Final answer
    x = 11,897.10

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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.