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Finding the Fourth Proportional to 1,210.81, 1,670.92 and 658.81

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Solution

The fourth proportional to 1,210.81, 1,670.92 and 658.81 is: 909.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.81 : 1,670.92 = 658.81 : x
  2. Step 2: Convert to fraction form
    1,210.81/1,670.92 = 658.81/x
  3. Step 3: Cross multiply
    1,210.81x = 1,670.92 × 658.81
  4. Step 4: Simplify right side
    1,210.81x = 1,100,823.81
  5. Step 5: Solve for x
    x = 1,100,823.81/1,210.81
  6. Step 6: Final answer
    x = 909.16

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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.