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Finding the Fourth Proportional to 1,210.70, 1,668.82 and 817.04

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Solution

The fourth proportional to 1,210.70, 1,668.82 and 817.04 is: 1,126.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.70 : 1,668.82 = 817.04 : x
  2. Step 2: Convert to fraction form
    1,210.70/1,668.82 = 817.04/x
  3. Step 3: Cross multiply
    1,210.70x = 1,668.82 × 817.04
  4. Step 4: Simplify right side
    1,210.70x = 1,363,492.69
  5. Step 5: Solve for x
    x = 1,363,492.69/1,210.70
  6. Step 6: Final answer
    x = 1,126.20

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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.