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Finding the Fourth Proportional to 61,488.81, 84,675.89 and 53,418.78

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Solution

The fourth proportional to 61,488.81, 84,675.89 and 53,418.78 is: 73,562.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,488.81 : 84,675.89 = 53,418.78 : x
  2. Step 2: Convert to fraction form
    61,488.81/84,675.89 = 53,418.78/x
  3. Step 3: Cross multiply
    61,488.81x = 84,675.89 × 53,418.78
  4. Step 4: Simplify right side
    61,488.81x = 4,523,282,739.21
  5. Step 5: Solve for x
    x = 4,523,282,739.21/61,488.81
  6. Step 6: Final answer
    x = 73,562.70

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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.