Home / 1,389.90-1,913.64-1,179.60

Finding the Fourth Proportional to 1,389.90, 1,913.64 and 1,179.60

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Solution

The fourth proportional to 1,389.90, 1,913.64 and 1,179.60 is: 1,624.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.90 : 1,913.64 = 1,179.60 : x
  2. Step 2: Convert to fraction form
    1,389.90/1,913.64 = 1,179.60/x
  3. Step 3: Cross multiply
    1,389.90x = 1,913.64 × 1,179.60
  4. Step 4: Simplify right side
    1,389.90x = 2,257,329.74
  5. Step 5: Solve for x
    x = 2,257,329.74/1,389.90
  6. Step 6: Final answer
    x = 1,624.10

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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.