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Finding the Fourth Proportional to 1,988.66, 2,981.81 and 756.16

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Solution

The fourth proportional to 1,988.66, 2,981.81 and 756.16 is: 1,133.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.66 : 2,981.81 = 756.16 : x
  2. Step 2: Convert to fraction form
    1,988.66/2,981.81 = 756.16/x
  3. Step 3: Cross multiply
    1,988.66x = 2,981.81 × 756.16
  4. Step 4: Simplify right side
    1,988.66x = 2,254,725.40
  5. Step 5: Solve for x
    x = 2,254,725.40/1,988.66
  6. Step 6: Final answer
    x = 1,133.79

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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.