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Finding the Fourth Proportional to 1,015.42, 1,521.81 and 553.31

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Solution

The fourth proportional to 1,015.42, 1,521.81 and 553.31 is: 829.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.42 : 1,521.81 = 553.31 : x
  2. Step 2: Convert to fraction form
    1,015.42/1,521.81 = 553.31/x
  3. Step 3: Cross multiply
    1,015.42x = 1,521.81 × 553.31
  4. Step 4: Simplify right side
    1,015.42x = 842,036.50
  5. Step 5: Solve for x
    x = 842,036.50/1,015.42
  6. Step 6: Final answer
    x = 829.25

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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.