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Finding the Fourth Proportional to 30,957.72, 42,721.74 and 16,810.62

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Solution

The fourth proportional to 30,957.72, 42,721.74 and 16,810.62 is: 23,198.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,957.72 : 42,721.74 = 16,810.62 : x
  2. Step 2: Convert to fraction form
    30,957.72/42,721.74 = 16,810.62/x
  3. Step 3: Cross multiply
    30,957.72x = 42,721.74 × 16,810.62
  4. Step 4: Simplify right side
    30,957.72x = 718,178,936.88
  5. Step 5: Solve for x
    x = 718,178,936.88/30,957.72
  6. Step 6: Final answer
    x = 23,198.70

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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.