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Finding the Fourth Proportional to 880.64, 1,320.34 and 386.81

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Solution

The fourth proportional to 880.64, 1,320.34 and 386.81 is: 579.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.64 : 1,320.34 = 386.81 : x
  2. Step 2: Convert to fraction form
    880.64/1,320.34 = 386.81/x
  3. Step 3: Cross multiply
    880.64x = 1,320.34 × 386.81
  4. Step 4: Simplify right side
    880.64x = 510,720.72
  5. Step 5: Solve for x
    x = 510,720.72/880.64
  6. Step 6: Final answer
    x = 579.94

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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.