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Finding the Fourth Proportional to 1,246.90, 1,720.70 and 687.36

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Solution

The fourth proportional to 1,246.90, 1,720.70 and 687.36 is: 948.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.90 : 1,720.70 = 687.36 : x
  2. Step 2: Convert to fraction form
    1,246.90/1,720.70 = 687.36/x
  3. Step 3: Cross multiply
    1,246.90x = 1,720.70 × 687.36
  4. Step 4: Simplify right side
    1,246.90x = 1,182,740.35
  5. Step 5: Solve for x
    x = 1,182,740.35/1,246.90
  6. Step 6: Final answer
    x = 948.54

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1.5x scale

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.