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Finding the Fourth Proportional to 1,129.48, 1,694.49 and 389.10

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Solution

The fourth proportional to 1,129.48, 1,694.49 and 389.10 is: 583.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.48 : 1,694.49 = 389.10 : x
  2. Step 2: Convert to fraction form
    1,129.48/1,694.49 = 389.10/x
  3. Step 3: Cross multiply
    1,129.48x = 1,694.49 × 389.10
  4. Step 4: Simplify right side
    1,129.48x = 659,326.06
  5. Step 5: Solve for x
    x = 659,326.06/1,129.48
  6. Step 6: Final answer
    x = 583.74

Related Problems

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Half scale
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Double scale
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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.