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Finding the Fourth Proportional to 771.95, 1,157.90 and 499.47

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Solution

The fourth proportional to 771.95, 1,157.90 and 499.47 is: 749.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.95 : 1,157.90 = 499.47 : x
  2. Step 2: Convert to fraction form
    771.95/1,157.90 = 499.47/x
  3. Step 3: Cross multiply
    771.95x = 1,157.90 × 499.47
  4. Step 4: Simplify right side
    771.95x = 578,333.82
  5. Step 5: Solve for x
    x = 578,333.82/771.95
  6. Step 6: Final answer
    x = 749.19

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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.