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Finding the Fourth Proportional to 555.85, 833.78 and 478.90

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Solution

The fourth proportional to 555.85, 833.78 and 478.90 is: 718.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.85 : 833.78 = 478.90 : x
  2. Step 2: Convert to fraction form
    555.85/833.78 = 478.90/x
  3. Step 3: Cross multiply
    555.85x = 833.78 × 478.90
  4. Step 4: Simplify right side
    555.85x = 399,294.85
  5. Step 5: Solve for x
    x = 399,294.85/555.85
  6. Step 6: Final answer
    x = 718.35

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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.