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Finding the Fourth Proportional to 57,905.50, 79,909.60 and 31,409.50

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Solution

The fourth proportional to 57,905.50, 79,909.60 and 31,409.50 is: 43,345.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,905.50 : 79,909.60 = 31,409.50 : x
  2. Step 2: Convert to fraction form
    57,905.50/79,909.60 = 31,409.50/x
  3. Step 3: Cross multiply
    57,905.50x = 79,909.60 × 31,409.50
  4. Step 4: Simplify right side
    57,905.50x = 2,509,920,581.20
  5. Step 5: Solve for x
    x = 2,509,920,581.20/57,905.50
  6. Step 6: Final answer
    x = 43,345.12

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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.