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Finding the Fourth Proportional to 527.85, 728.19 and 485.73

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Solution

The fourth proportional to 527.85, 728.19 and 485.73 is: 670.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.85 : 728.19 = 485.73 : x
  2. Step 2: Convert to fraction form
    527.85/728.19 = 485.73/x
  3. Step 3: Cross multiply
    527.85x = 728.19 × 485.73
  4. Step 4: Simplify right side
    527.85x = 353,703.73
  5. Step 5: Solve for x
    x = 353,703.73/527.85
  6. Step 6: Final answer
    x = 670.08

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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.