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Finding the Fourth Proportional to 76,440.48, 105,476.44 and 42,900

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Solution

The fourth proportional to 76,440.48, 105,476.44 and 42,900 is: 59,195.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,440.48 : 105,476.44 = 42,900 : x
  2. Step 2: Convert to fraction form
    76,440.48/105,476.44 = 42,900/x
  3. Step 3: Cross multiply
    76,440.48x = 105,476.44 × 42,900
  4. Step 4: Simplify right side
    76,440.48x = 4,524,939,276
  5. Step 5: Solve for x
    x = 4,524,939,276/76,440.48
  6. Step 6: Final answer
    x = 59,195.59

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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.