Home / 1,127.80-1,690.10-549.40

Finding the Fourth Proportional to 1,127.80, 1,690.10 and 549.40

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Solution

The fourth proportional to 1,127.80, 1,690.10 and 549.40 is: 823.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.80 : 1,690.10 = 549.40 : x
  2. Step 2: Convert to fraction form
    1,127.80/1,690.10 = 549.40/x
  3. Step 3: Cross multiply
    1,127.80x = 1,690.10 × 549.40
  4. Step 4: Simplify right side
    1,127.80x = 928,540.94
  5. Step 5: Solve for x
    x = 928,540.94/1,127.80
  6. Step 6: Final answer
    x = 823.32

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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.