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Finding the Fourth Proportional to 567.78, 782.76 and 485.76

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Solution

The fourth proportional to 567.78, 782.76 and 485.76 is: 669.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    567.78 : 782.76 = 485.76 : x
  2. Step 2: Convert to fraction form
    567.78/782.76 = 485.76/x
  3. Step 3: Cross multiply
    567.78x = 782.76 × 485.76
  4. Step 4: Simplify right side
    567.78x = 380,233.50
  5. Step 5: Solve for x
    x = 380,233.50/567.78
  6. Step 6: Final answer
    x = 669.68

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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.