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Finding the Fourth Proportional to 988.16, 1,364.96 and 756.48

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Solution

The fourth proportional to 988.16, 1,364.96 and 756.48 is: 1,044.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.16 : 1,364.96 = 756.48 : x
  2. Step 2: Convert to fraction form
    988.16/1,364.96 = 756.48/x
  3. Step 3: Cross multiply
    988.16x = 1,364.96 × 756.48
  4. Step 4: Simplify right side
    988.16x = 1,032,564.94
  5. Step 5: Solve for x
    x = 1,032,564.94/988.16
  6. Step 6: Final answer
    x = 1,044.94

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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.