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Finding the Fourth Proportional to 42,889.92, 64,336.93 and 20,721.94

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Solution

The fourth proportional to 42,889.92, 64,336.93 and 20,721.94 is: 31,083.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,889.92 : 64,336.93 = 20,721.94 : x
  2. Step 2: Convert to fraction form
    42,889.92/64,336.93 = 20,721.94/x
  3. Step 3: Cross multiply
    42,889.92x = 64,336.93 × 20,721.94
  4. Step 4: Simplify right side
    42,889.92x = 1,333,185,866.50
  5. Step 5: Solve for x
    x = 1,333,185,866.50/42,889.92
  6. Step 6: Final answer
    x = 31,083.90

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1.5x scale

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.