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Finding the Fourth Proportional to 528.58, 728.72 and 395.99

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Solution

The fourth proportional to 528.58, 728.72 and 395.99 is: 545.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.58 : 728.72 = 395.99 : x
  2. Step 2: Convert to fraction form
    528.58/728.72 = 395.99/x
  3. Step 3: Cross multiply
    528.58x = 728.72 × 395.99
  4. Step 4: Simplify right side
    528.58x = 288,565.83
  5. Step 5: Solve for x
    x = 288,565.83/528.58
  6. Step 6: Final answer
    x = 545.93

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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.