Home / 1,126.80-1,688.40-943.20

Finding the Fourth Proportional to 1,126.80, 1,688.40 and 943.20

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Solution

The fourth proportional to 1,126.80, 1,688.40 and 943.20 is: 1,413.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.80 : 1,688.40 = 943.20 : x
  2. Step 2: Convert to fraction form
    1,126.80/1,688.40 = 943.20/x
  3. Step 3: Cross multiply
    1,126.80x = 1,688.40 × 943.20
  4. Step 4: Simplify right side
    1,126.80x = 1,592,498.88
  5. Step 5: Solve for x
    x = 1,592,498.88/1,126.80
  6. Step 6: Final answer
    x = 1,413.29

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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.