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Finding the Fourth Proportional to 2,157.04, 3,234.76 and 770

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Solution

The fourth proportional to 2,157.04, 3,234.76 and 770 is: 1,154.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.04 : 3,234.76 = 770 : x
  2. Step 2: Convert to fraction form
    2,157.04/3,234.76 = 770/x
  3. Step 3: Cross multiply
    2,157.04x = 3,234.76 × 770
  4. Step 4: Simplify right side
    2,157.04x = 2,490,761.35
  5. Step 5: Solve for x
    x = 2,490,761.35/2,157.04
  6. Step 6: Final answer
    x = 1,154.72

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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.