Home / 1,390.24-2,085.84-621.04

Finding the Fourth Proportional to 1,390.24, 2,085.84 and 621.04

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Solution

The fourth proportional to 1,390.24, 2,085.84 and 621.04 is: 931.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.24 : 2,085.84 = 621.04 : x
  2. Step 2: Convert to fraction form
    1,390.24/2,085.84 = 621.04/x
  3. Step 3: Cross multiply
    1,390.24x = 2,085.84 × 621.04
  4. Step 4: Simplify right side
    1,390.24x = 1,295,390.07
  5. Step 5: Solve for x
    x = 1,295,390.07/1,390.24
  6. Step 6: Final answer
    x = 931.77

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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.