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Finding the Fourth Proportional to 1,210.90, 1,668.91 and 999.84

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Solution

The fourth proportional to 1,210.90, 1,668.91 and 999.84 is: 1,378.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.90 : 1,668.91 = 999.84 : x
  2. Step 2: Convert to fraction form
    1,210.90/1,668.91 = 999.84/x
  3. Step 3: Cross multiply
    1,210.90x = 1,668.91 × 999.84
  4. Step 4: Simplify right side
    1,210.90x = 1,668,642.97
  5. Step 5: Solve for x
    x = 1,668,642.97/1,210.90
  6. Step 6: Final answer
    x = 1,378.02

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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.