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Finding the Fourth Proportional to 1,561.70, 2,155.14 and 863.08

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Solution

The fourth proportional to 1,561.70, 2,155.14 and 863.08 is: 1,191.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.70 : 2,155.14 = 863.08 : x
  2. Step 2: Convert to fraction form
    1,561.70/2,155.14 = 863.08/x
  3. Step 3: Cross multiply
    1,561.70x = 2,155.14 × 863.08
  4. Step 4: Simplify right side
    1,561.70x = 1,860,058.23
  5. Step 5: Solve for x
    x = 1,860,058.23/1,561.70
  6. Step 6: Final answer
    x = 1,191.05

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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.