Home / 1,191.40-1,787.10-608.20

Finding the Fourth Proportional to 1,191.40, 1,787.10 and 608.20

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Solution

The fourth proportional to 1,191.40, 1,787.10 and 608.20 is: 912.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.40 : 1,787.10 = 608.20 : x
  2. Step 2: Convert to fraction form
    1,191.40/1,787.10 = 608.20/x
  3. Step 3: Cross multiply
    1,191.40x = 1,787.10 × 608.20
  4. Step 4: Simplify right side
    1,191.40x = 1,086,914.22
  5. Step 5: Solve for x
    x = 1,086,914.22/1,191.40
  6. Step 6: Final answer
    x = 912.30

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1.5x scale

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.