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Finding the Fourth Proportional to 988.96, 1,490.95 and 936.04

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Solution

The fourth proportional to 988.96, 1,490.95 and 936.04 is: 1,411.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.96 : 1,490.95 = 936.04 : x
  2. Step 2: Convert to fraction form
    988.96/1,490.95 = 936.04/x
  3. Step 3: Cross multiply
    988.96x = 1,490.95 × 936.04
  4. Step 4: Simplify right side
    988.96x = 1,395,588.84
  5. Step 5: Solve for x
    x = 1,395,588.84/988.96
  6. Step 6: Final answer
    x = 1,411.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.