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Finding the Fourth Proportional to 817.86, 1,128.90 and 468.78

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Solution

The fourth proportional to 817.86, 1,128.90 and 468.78 is: 647.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.86 : 1,128.90 = 468.78 : x
  2. Step 2: Convert to fraction form
    817.86/1,128.90 = 468.78/x
  3. Step 3: Cross multiply
    817.86x = 1,128.90 × 468.78
  4. Step 4: Simplify right side
    817.86x = 529,205.74
  5. Step 5: Solve for x
    x = 529,205.74/817.86
  6. Step 6: Final answer
    x = 647.06

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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.