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Finding the Fourth Proportional to 1,235.40, 1,853.10 and 659.40

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Solution

The fourth proportional to 1,235.40, 1,853.10 and 659.40 is: 989.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.40 : 1,853.10 = 659.40 : x
  2. Step 2: Convert to fraction form
    1,235.40/1,853.10 = 659.40/x
  3. Step 3: Cross multiply
    1,235.40x = 1,853.10 × 659.40
  4. Step 4: Simplify right side
    1,235.40x = 1,221,934.14
  5. Step 5: Solve for x
    x = 1,221,934.14/1,235.40
  6. Step 6: Final answer
    x = 989.10

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Double scale
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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.