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Finding the Fourth Proportional to 58,215, 80,336.70 and 31,719

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Solution

The fourth proportional to 58,215, 80,336.70 and 31,719 is: 43,772.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,215 : 80,336.70 = 31,719 : x
  2. Step 2: Convert to fraction form
    58,215/80,336.70 = 31,719/x
  3. Step 3: Cross multiply
    58,215x = 80,336.70 × 31,719
  4. Step 4: Simplify right side
    58,215x = 2,548,199,787.30
  5. Step 5: Solve for x
    x = 2,548,199,787.30/58,215
  6. Step 6: Final answer
    x = 43,772.22

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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.