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Finding the Fourth Proportional to 779.86, 1,076.21 and 430.55

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Solution

The fourth proportional to 779.86, 1,076.21 and 430.55 is: 594.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.86 : 1,076.21 = 430.55 : x
  2. Step 2: Convert to fraction form
    779.86/1,076.21 = 430.55/x
  3. Step 3: Cross multiply
    779.86x = 1,076.21 × 430.55
  4. Step 4: Simplify right side
    779.86x = 463,360.33
  5. Step 5: Solve for x
    x = 463,360.33/779.86
  6. Step 6: Final answer
    x = 594.16

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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.