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Finding the Fourth Proportional to 1,668.80, 2,503.20 and 891.20

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Solution

The fourth proportional to 1,668.80, 2,503.20 and 891.20 is: 1,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,668.80 : 2,503.20 = 891.20 : x
  2. Step 2: Convert to fraction form
    1,668.80/2,503.20 = 891.20/x
  3. Step 3: Cross multiply
    1,668.80x = 2,503.20 × 891.20
  4. Step 4: Simplify right side
    1,668.80x = 2,230,851.84
  5. Step 5: Solve for x
    x = 2,230,851.84/1,668.80
  6. Step 6: Final answer
    x = 1,336.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.