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Finding the Fourth Proportional to 1,210.25, 1,670.15 and 658.25

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Solution

The fourth proportional to 1,210.25, 1,670.15 and 658.25 is: 908.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.25 : 1,670.15 = 658.25 : x
  2. Step 2: Convert to fraction form
    1,210.25/1,670.15 = 658.25/x
  3. Step 3: Cross multiply
    1,210.25x = 1,670.15 × 658.25
  4. Step 4: Simplify right side
    1,210.25x = 1,099,372.95
  5. Step 5: Solve for x
    x = 1,099,372.95/1,210.25
  6. Step 6: Final answer
    x = 908.39

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1.5x scale

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.