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Finding the Fourth Proportional to 879.96, 1,320.01 and 386.40

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Solution

The fourth proportional to 879.96, 1,320.01 and 386.40 is: 579.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.96 : 1,320.01 = 386.40 : x
  2. Step 2: Convert to fraction form
    879.96/1,320.01 = 386.40/x
  3. Step 3: Cross multiply
    879.96x = 1,320.01 × 386.40
  4. Step 4: Simplify right side
    879.96x = 510,051.86
  5. Step 5: Solve for x
    x = 510,051.86/879.96
  6. Step 6: Final answer
    x = 579.63

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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.