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Finding the Fourth Proportional to 771.90, 1,157.88 and 284.98

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Solution

The fourth proportional to 771.90, 1,157.88 and 284.98 is: 427.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.90 : 1,157.88 = 284.98 : x
  2. Step 2: Convert to fraction form
    771.90/1,157.88 = 284.98/x
  3. Step 3: Cross multiply
    771.90x = 1,157.88 × 284.98
  4. Step 4: Simplify right side
    771.90x = 329,972.64
  5. Step 5: Solve for x
    x = 329,972.64/771.90
  6. Step 6: Final answer
    x = 427.48

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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.