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Finding the Fourth Proportional to 1,529.76, 2,111.06 and 831.12

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Solution

The fourth proportional to 1,529.76, 2,111.06 and 831.12 is: 1,146.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,529.76 : 2,111.06 = 831.12 : x
  2. Step 2: Convert to fraction form
    1,529.76/2,111.06 = 831.12/x
  3. Step 3: Cross multiply
    1,529.76x = 2,111.06 × 831.12
  4. Step 4: Simplify right side
    1,529.76x = 1,754,544.19
  5. Step 5: Solve for x
    x = 1,754,544.19/1,529.76
  6. Step 6: Final answer
    x = 1,146.94

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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.