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Finding the Fourth Proportional to 555.78, 766.90 and 307.10

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Solution

The fourth proportional to 555.78, 766.90 and 307.10 is: 423.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.78 : 766.90 = 307.10 : x
  2. Step 2: Convert to fraction form
    555.78/766.90 = 307.10/x
  3. Step 3: Cross multiply
    555.78x = 766.90 × 307.10
  4. Step 4: Simplify right side
    555.78x = 235,514.99
  5. Step 5: Solve for x
    x = 235,514.99/555.78
  6. Step 6: Final answer
    x = 423.76

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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.