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Finding the Fourth Proportional to 1,217.53, 1,679.23 and 720.16

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Solution

The fourth proportional to 1,217.53, 1,679.23 and 720.16 is: 993.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.53 : 1,679.23 = 720.16 : x
  2. Step 2: Convert to fraction form
    1,217.53/1,679.23 = 720.16/x
  3. Step 3: Cross multiply
    1,217.53x = 1,679.23 × 720.16
  4. Step 4: Simplify right side
    1,217.53x = 1,209,314.28
  5. Step 5: Solve for x
    x = 1,209,314.28/1,217.53
  6. Step 6: Final answer
    x = 993.25

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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.