Home / 1,530.50-2,112.10-831.90

Finding the Fourth Proportional to 1,530.50, 2,112.10 and 831.90

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Solution

The fourth proportional to 1,530.50, 2,112.10 and 831.90 is: 1,148.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,530.50 : 2,112.10 = 831.90 : x
  2. Step 2: Convert to fraction form
    1,530.50/2,112.10 = 831.90/x
  3. Step 3: Cross multiply
    1,530.50x = 2,112.10 × 831.90
  4. Step 4: Simplify right side
    1,530.50x = 1,757,055.99
  5. Step 5: Solve for x
    x = 1,757,055.99/1,530.50
  6. Step 6: Final answer
    x = 1,148.03

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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.