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Finding the Fourth Proportional to 771.66, 1,156.80 and 284.60

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Solution

The fourth proportional to 771.66, 1,156.80 and 284.60 is: 426.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.66 : 1,156.80 = 284.60 : x
  2. Step 2: Convert to fraction form
    771.66/1,156.80 = 284.60/x
  3. Step 3: Cross multiply
    771.66x = 1,156.80 × 284.60
  4. Step 4: Simplify right side
    771.66x = 329,225.28
  5. Step 5: Solve for x
    x = 329,225.28/771.66
  6. Step 6: Final answer
    x = 426.65

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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.