Home / 1,178.40-1,622.80-1,001.60

Finding the Fourth Proportional to 1,178.40, 1,622.80 and 1,001.60

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Solution

The fourth proportional to 1,178.40, 1,622.80 and 1,001.60 is: 1,379.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.40 : 1,622.80 = 1,001.60 : x
  2. Step 2: Convert to fraction form
    1,178.40/1,622.80 = 1,001.60/x
  3. Step 3: Cross multiply
    1,178.40x = 1,622.80 × 1,001.60
  4. Step 4: Simplify right side
    1,178.40x = 1,625,396.48
  5. Step 5: Solve for x
    x = 1,625,396.48/1,178.40
  6. Step 6: Final answer
    x = 1,379.32

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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.