Home / 30,555.46-42,153.51-21,107.62

Finding the Fourth Proportional to 30,555.46, 42,153.51 and 21,107.62

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Solution

The fourth proportional to 30,555.46, 42,153.51 and 21,107.62 is: 29,119.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,555.46 : 42,153.51 = 21,107.62 : x
  2. Step 2: Convert to fraction form
    30,555.46/42,153.51 = 21,107.62/x
  3. Step 3: Cross multiply
    30,555.46x = 42,153.51 × 21,107.62
  4. Step 4: Simplify right side
    30,555.46x = 889,760,270.75
  5. Step 5: Solve for x
    x = 889,760,270.75/30,555.46
  6. Step 6: Final answer
    x = 29,119.52

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Half scale
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Double scale
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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.