Home / 1,108.20-1,528.56-688.12

Finding the Fourth Proportional to 1,108.20, 1,528.56 and 688.12

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Solution

The fourth proportional to 1,108.20, 1,528.56 and 688.12 is: 949.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.20 : 1,528.56 = 688.12 : x
  2. Step 2: Convert to fraction form
    1,108.20/1,528.56 = 688.12/x
  3. Step 3: Cross multiply
    1,108.20x = 1,528.56 × 688.12
  4. Step 4: Simplify right side
    1,108.20x = 1,051,832.71
  5. Step 5: Solve for x
    x = 1,051,832.71/1,108.20
  6. Step 6: Final answer
    x = 949.14

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1.5x scale

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.