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Finding the Fourth Proportional to 91,610, 126,421.80 and 51,866

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Solution

The fourth proportional to 91,610, 126,421.80 and 51,866 is: 71,575.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,610 : 126,421.80 = 51,866 : x
  2. Step 2: Convert to fraction form
    91,610/126,421.80 = 51,866/x
  3. Step 3: Cross multiply
    91,610x = 126,421.80 × 51,866
  4. Step 4: Simplify right side
    91,610x = 6,556,993,078.80
  5. Step 5: Solve for x
    x = 6,556,993,078.80/91,610
  6. Step 6: Final answer
    x = 71,575.08

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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.