Home / 1,118.20-1,674.10-990.20

Finding the Fourth Proportional to 1,118.20, 1,674.10 and 990.20

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Solution

The fourth proportional to 1,118.20, 1,674.10 and 990.20 is: 1,482.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.20 : 1,674.10 = 990.20 : x
  2. Step 2: Convert to fraction form
    1,118.20/1,674.10 = 990.20/x
  3. Step 3: Cross multiply
    1,118.20x = 1,674.10 × 990.20
  4. Step 4: Simplify right side
    1,118.20x = 1,657,693.82
  5. Step 5: Solve for x
    x = 1,657,693.82/1,118.20
  6. Step 6: Final answer
    x = 1,482.47

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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.