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Finding the Fourth Proportional to 30,787.65, 42,486.98 and 16,640.51

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Solution

The fourth proportional to 30,787.65, 42,486.98 and 16,640.51 is: 22,963.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,787.65 : 42,486.98 = 16,640.51 : x
  2. Step 2: Convert to fraction form
    30,787.65/42,486.98 = 16,640.51/x
  3. Step 3: Cross multiply
    30,787.65x = 42,486.98 × 16,640.51
  4. Step 4: Simplify right side
    30,787.65x = 707,004,719.92
  5. Step 5: Solve for x
    x = 707,004,719.92/30,787.65
  6. Step 6: Final answer
    x = 22,963.91

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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.