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Finding the Fourth Proportional to 984.84, 1,357.81 and 807.14

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Solution

The fourth proportional to 984.84, 1,357.81 and 807.14 is: 1,112.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.84 : 1,357.81 = 807.14 : x
  2. Step 2: Convert to fraction form
    984.84/1,357.81 = 807.14/x
  3. Step 3: Cross multiply
    984.84x = 1,357.81 × 807.14
  4. Step 4: Simplify right side
    984.84x = 1,095,942.76
  5. Step 5: Solve for x
    x = 1,095,942.76/984.84
  6. Step 6: Final answer
    x = 1,112.81

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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.