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Finding the Fourth Proportional to 85,275.48, 117,662.20 and 61,455

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Solution

The fourth proportional to 85,275.48, 117,662.20 and 61,455 is: 84,794.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,275.48 : 117,662.20 = 61,455 : x
  2. Step 2: Convert to fraction form
    85,275.48/117,662.20 = 61,455/x
  3. Step 3: Cross multiply
    85,275.48x = 117,662.20 × 61,455
  4. Step 4: Simplify right side
    85,275.48x = 7,230,930,501
  5. Step 5: Solve for x
    x = 7,230,930,501/85,275.48
  6. Step 6: Final answer
    x = 84,794.96

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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.