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Finding the Fourth Proportional to 61,405.92, 92,111.49 and 21,428.93

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Solution

The fourth proportional to 61,405.92, 92,111.49 and 21,428.93 is: 32,144.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,405.92 : 92,111.49 = 21,428.93 : x
  2. Step 2: Convert to fraction form
    61,405.92/92,111.49 = 21,428.93/x
  3. Step 3: Cross multiply
    61,405.92x = 92,111.49 × 21,428.93
  4. Step 4: Simplify right side
    61,405.92x = 1,973,850,671.41
  5. Step 5: Solve for x
    x = 1,973,850,671.41/61,405.92
  6. Step 6: Final answer
    x = 32,144.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.