Home / 1,247.08-1,870.38-425.28

Finding the Fourth Proportional to 1,247.08, 1,870.38 and 425.28

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Solution

The fourth proportional to 1,247.08, 1,870.38 and 425.28 is: 637.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.08 : 1,870.38 = 425.28 : x
  2. Step 2: Convert to fraction form
    1,247.08/1,870.38 = 425.28/x
  3. Step 3: Cross multiply
    1,247.08x = 1,870.38 × 425.28
  4. Step 4: Simplify right side
    1,247.08x = 795,435.21
  5. Step 5: Solve for x
    x = 795,435.21/1,247.08
  6. Step 6: Final answer
    x = 637.84

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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.