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Finding the Fourth Proportional to 1,210.18, 1,668.71 and 790.38

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Solution

The fourth proportional to 1,210.18, 1,668.71 and 790.38 is: 1,089.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.18 : 1,668.71 = 790.38 : x
  2. Step 2: Convert to fraction form
    1,210.18/1,668.71 = 790.38/x
  3. Step 3: Cross multiply
    1,210.18x = 1,668.71 × 790.38
  4. Step 4: Simplify right side
    1,210.18x = 1,318,911.06
  5. Step 5: Solve for x
    x = 1,318,911.06/1,210.18
  6. Step 6: Final answer
    x = 1,089.85

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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.