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Finding the Fourth Proportional to 61,391.39, 84,712.53 and 38,721.81

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Solution

The fourth proportional to 61,391.39, 84,712.53 and 38,721.81 is: 53,431.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,391.39 : 84,712.53 = 38,721.81 : x
  2. Step 2: Convert to fraction form
    61,391.39/84,712.53 = 38,721.81/x
  3. Step 3: Cross multiply
    61,391.39x = 84,712.53 × 38,721.81
  4. Step 4: Simplify right side
    61,391.39x = 3,280,222,954.16
  5. Step 5: Solve for x
    x = 3,280,222,954.16/61,391.39
  6. Step 6: Final answer
    x = 53,431.32

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1.5x scale

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.