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Finding the Fourth Proportional to 1,015.07, 1,521.45 and 398.66

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Solution

The fourth proportional to 1,015.07, 1,521.45 and 398.66 is: 597.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.07 : 1,521.45 = 398.66 : x
  2. Step 2: Convert to fraction form
    1,015.07/1,521.45 = 398.66/x
  3. Step 3: Cross multiply
    1,015.07x = 1,521.45 × 398.66
  4. Step 4: Simplify right side
    1,015.07x = 606,533.65
  5. Step 5: Solve for x
    x = 606,533.65/1,015.07
  6. Step 6: Final answer
    x = 597.53

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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.