Home / 1,390.02-2,081.32-1,147.62

Finding the Fourth Proportional to 1,390.02, 2,081.32 and 1,147.62

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Solution

The fourth proportional to 1,390.02, 2,081.32 and 1,147.62 is: 1,718.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.02 : 2,081.32 = 1,147.62 : x
  2. Step 2: Convert to fraction form
    1,390.02/2,081.32 = 1,147.62/x
  3. Step 3: Cross multiply
    1,390.02x = 2,081.32 × 1,147.62
  4. Step 4: Simplify right side
    1,390.02x = 2,388,564.46
  5. Step 5: Solve for x
    x = 2,388,564.46/1,390.02
  6. Step 6: Final answer
    x = 1,718.37

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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.