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Finding the Fourth Proportional to 776.15, 1,164.18 and 654.20

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Solution

The fourth proportional to 776.15, 1,164.18 and 654.20 is: 981.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.15 : 1,164.18 = 654.20 : x
  2. Step 2: Convert to fraction form
    776.15/1,164.18 = 654.20/x
  3. Step 3: Cross multiply
    776.15x = 1,164.18 × 654.20
  4. Step 4: Simplify right side
    776.15x = 761,606.56
  5. Step 5: Solve for x
    x = 761,606.56/776.15
  6. Step 6: Final answer
    x = 981.26

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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.