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Finding the Fourth Proportional to 988.73, 1,364.19 and 670.28

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Solution

The fourth proportional to 988.73, 1,364.19 and 670.28 is: 924.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.73 : 1,364.19 = 670.28 : x
  2. Step 2: Convert to fraction form
    988.73/1,364.19 = 670.28/x
  3. Step 3: Cross multiply
    988.73x = 1,364.19 × 670.28
  4. Step 4: Simplify right side
    988.73x = 914,382.45
  5. Step 5: Solve for x
    x = 914,382.45/988.73
  6. Step 6: Final answer
    x = 924.81

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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.