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Finding the Fourth Proportional to 1,221.07, 1,831.80 and 528.07

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Solution

The fourth proportional to 1,221.07, 1,831.80 and 528.07 is: 792.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.07 : 1,831.80 = 528.07 : x
  2. Step 2: Convert to fraction form
    1,221.07/1,831.80 = 528.07/x
  3. Step 3: Cross multiply
    1,221.07x = 1,831.80 × 528.07
  4. Step 4: Simplify right side
    1,221.07x = 967,318.63
  5. Step 5: Solve for x
    x = 967,318.63/1,221.07
  6. Step 6: Final answer
    x = 792.19

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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.