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Finding the Fourth Proportional to 1,436.80, 2,155.36 and 570.88

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Solution

The fourth proportional to 1,436.80, 2,155.36 and 570.88 is: 856.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,436.80 : 2,155.36 = 570.88 : x
  2. Step 2: Convert to fraction form
    1,436.80/2,155.36 = 570.88/x
  3. Step 3: Cross multiply
    1,436.80x = 2,155.36 × 570.88
  4. Step 4: Simplify right side
    1,436.80x = 1,230,451.92
  5. Step 5: Solve for x
    x = 1,230,451.92/1,436.80
  6. Step 6: Final answer
    x = 856.38

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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.