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Finding the Fourth Proportional to 1,561.32, 2,154.63 and 862.70

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Solution

The fourth proportional to 1,561.32, 2,154.63 and 862.70 is: 1,190.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.32 : 2,154.63 = 862.70 : x
  2. Step 2: Convert to fraction form
    1,561.32/2,154.63 = 862.70/x
  3. Step 3: Cross multiply
    1,561.32x = 2,154.63 × 862.70
  4. Step 4: Simplify right side
    1,561.32x = 1,858,788.53
  5. Step 5: Solve for x
    x = 1,858,788.53/1,561.32
  6. Step 6: Final answer
    x = 1,190.52

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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.