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Finding the Fourth Proportional to 1,135.70, 1,702.40 and 404.87

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Solution

The fourth proportional to 1,135.70, 1,702.40 and 404.87 is: 606.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.70 : 1,702.40 = 404.87 : x
  2. Step 2: Convert to fraction form
    1,135.70/1,702.40 = 404.87/x
  3. Step 3: Cross multiply
    1,135.70x = 1,702.40 × 404.87
  4. Step 4: Simplify right side
    1,135.70x = 689,252.92
  5. Step 5: Solve for x
    x = 689,252.92/1,135.70
  6. Step 6: Final answer
    x = 606.90

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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.