Home / 1,108.10-1,528.93-931.75

Finding the Fourth Proportional to 1,108.10, 1,528.93 and 931.75

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Solution

The fourth proportional to 1,108.10, 1,528.93 and 931.75 is: 1,285.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.10 : 1,528.93 = 931.75 : x
  2. Step 2: Convert to fraction form
    1,108.10/1,528.93 = 931.75/x
  3. Step 3: Cross multiply
    1,108.10x = 1,528.93 × 931.75
  4. Step 4: Simplify right side
    1,108.10x = 1,424,580.53
  5. Step 5: Solve for x
    x = 1,424,580.53/1,108.10
  6. Step 6: Final answer
    x = 1,285.61

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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.