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Finding the Fourth Proportional to 1,561.36, 2,154.68 and 853.21

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Solution

The fourth proportional to 1,561.36, 2,154.68 and 853.21 is: 1,177.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.36 : 2,154.68 = 853.21 : x
  2. Step 2: Convert to fraction form
    1,561.36/2,154.68 = 853.21/x
  3. Step 3: Cross multiply
    1,561.36x = 2,154.68 × 853.21
  4. Step 4: Simplify right side
    1,561.36x = 1,838,384.87
  5. Step 5: Solve for x
    x = 1,838,384.87/1,561.36
  6. Step 6: Final answer
    x = 1,177.43

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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.