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Finding the Fourth Proportional to 1,571.60, 2,168.79 and 853.79

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Solution

The fourth proportional to 1,571.60, 2,168.79 and 853.79 is: 1,178.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.60 : 2,168.79 = 853.79 : x
  2. Step 2: Convert to fraction form
    1,571.60/2,168.79 = 853.79/x
  3. Step 3: Cross multiply
    1,571.60x = 2,168.79 × 853.79
  4. Step 4: Simplify right side
    1,571.60x = 1,851,700.17
  5. Step 5: Solve for x
    x = 1,851,700.17/1,571.60
  6. Step 6: Final answer
    x = 1,178.23

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1.5x scale

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.