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Finding the Fourth Proportional to 771.54, 1,064.78 and 476.70

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Solution

The fourth proportional to 771.54, 1,064.78 and 476.70 is: 657.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.54 : 1,064.78 = 476.70 : x
  2. Step 2: Convert to fraction form
    771.54/1,064.78 = 476.70/x
  3. Step 3: Cross multiply
    771.54x = 1,064.78 × 476.70
  4. Step 4: Simplify right side
    771.54x = 507,580.63
  5. Step 5: Solve for x
    x = 507,580.63/771.54
  6. Step 6: Final answer
    x = 657.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.