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Finding the Fourth Proportional to 2,157.48, 3,235.80 and 770.76

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Solution

The fourth proportional to 2,157.48, 3,235.80 and 770.76 is: 1,155.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.48 : 3,235.80 = 770.76 : x
  2. Step 2: Convert to fraction form
    2,157.48/3,235.80 = 770.76/x
  3. Step 3: Cross multiply
    2,157.48x = 3,235.80 × 770.76
  4. Step 4: Simplify right side
    2,157.48x = 2,494,025.21
  5. Step 5: Solve for x
    x = 2,494,025.21/2,157.48
  6. Step 6: Final answer
    x = 1,155.99

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1.5x scale

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.