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Finding the Fourth Proportional to 1,381.64, 1,905.96 and 988.89

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Solution

The fourth proportional to 1,381.64, 1,905.96 and 988.89 is: 1,364.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.64 : 1,905.96 = 988.89 : x
  2. Step 2: Convert to fraction form
    1,381.64/1,905.96 = 988.89/x
  3. Step 3: Cross multiply
    1,381.64x = 1,905.96 × 988.89
  4. Step 4: Simplify right side
    1,381.64x = 1,884,781.35
  5. Step 5: Solve for x
    x = 1,884,781.35/1,381.64
  6. Step 6: Final answer
    x = 1,364.17

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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.