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Finding the Fourth Proportional to 874.16, 1,311 and 777.20

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Solution

The fourth proportional to 874.16, 1,311 and 777.20 is: 1,165.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.16 : 1,311 = 777.20 : x
  2. Step 2: Convert to fraction form
    874.16/1,311 = 777.20/x
  3. Step 3: Cross multiply
    874.16x = 1,311 × 777.20
  4. Step 4: Simplify right side
    874.16x = 1,018,909.20
  5. Step 5: Solve for x
    x = 1,018,909.20/874.16
  6. Step 6: Final answer
    x = 1,165.59

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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.