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Finding the Fourth Proportional to 1,106.42, 1,658.72 and 412.64

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Solution

The fourth proportional to 1,106.42, 1,658.72 and 412.64 is: 618.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.42 : 1,658.72 = 412.64 : x
  2. Step 2: Convert to fraction form
    1,106.42/1,658.72 = 412.64/x
  3. Step 3: Cross multiply
    1,106.42x = 1,658.72 × 412.64
  4. Step 4: Simplify right side
    1,106.42x = 684,454.22
  5. Step 5: Solve for x
    x = 684,454.22/1,106.42
  6. Step 6: Final answer
    x = 618.62

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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.