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Finding the Fourth Proportional to 1,192.84, 1,645.40 and 720.40

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Solution

The fourth proportional to 1,192.84, 1,645.40 and 720.40 is: 993.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.84 : 1,645.40 = 720.40 : x
  2. Step 2: Convert to fraction form
    1,192.84/1,645.40 = 720.40/x
  3. Step 3: Cross multiply
    1,192.84x = 1,645.40 × 720.40
  4. Step 4: Simplify right side
    1,192.84x = 1,185,346.16
  5. Step 5: Solve for x
    x = 1,185,346.16/1,192.84
  6. Step 6: Final answer
    x = 993.72

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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.