Home / 1,670.40-2,506.56-1,385.28

Finding the Fourth Proportional to 1,670.40, 2,506.56 and 1,385.28

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Solution

The fourth proportional to 1,670.40, 2,506.56 and 1,385.28 is: 2,078.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.40 : 2,506.56 = 1,385.28 : x
  2. Step 2: Convert to fraction form
    1,670.40/2,506.56 = 1,385.28/x
  3. Step 3: Cross multiply
    1,670.40x = 2,506.56 × 1,385.28
  4. Step 4: Simplify right side
    1,670.40x = 3,472,287.44
  5. Step 5: Solve for x
    x = 3,472,287.44/1,670.40
  6. Step 6: Final answer
    x = 2,078.72

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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.