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Finding the Fourth Proportional to 57,621, 79,516.98 and 31,125

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Solution

The fourth proportional to 57,621, 79,516.98 and 31,125 is: 42,952.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,621 : 79,516.98 = 31,125 : x
  2. Step 2: Convert to fraction form
    57,621/79,516.98 = 31,125/x
  3. Step 3: Cross multiply
    57,621x = 79,516.98 × 31,125
  4. Step 4: Simplify right side
    57,621x = 2,474,966,002.50
  5. Step 5: Solve for x
    x = 2,474,966,002.50/57,621
  6. Step 6: Final answer
    x = 42,952.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.