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Finding the Fourth Proportional to 1,210.96, 1,669.98 and 813.52

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Solution

The fourth proportional to 1,210.96, 1,669.98 and 813.52 is: 1,121.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.96 : 1,669.98 = 813.52 : x
  2. Step 2: Convert to fraction form
    1,210.96/1,669.98 = 813.52/x
  3. Step 3: Cross multiply
    1,210.96x = 1,669.98 × 813.52
  4. Step 4: Simplify right side
    1,210.96x = 1,358,562.13
  5. Step 5: Solve for x
    x = 1,358,562.13/1,210.96
  6. Step 6: Final answer
    x = 1,121.89

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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.