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Finding the Fourth Proportional to 1,018.84, 1,405.20 and 704.23

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Solution

The fourth proportional to 1,018.84, 1,405.20 and 704.23 is: 971.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.84 : 1,405.20 = 704.23 : x
  2. Step 2: Convert to fraction form
    1,018.84/1,405.20 = 704.23/x
  3. Step 3: Cross multiply
    1,018.84x = 1,405.20 × 704.23
  4. Step 4: Simplify right side
    1,018.84x = 989,580.47
  5. Step 5: Solve for x
    x = 989,580.47/1,018.84
  6. Step 6: Final answer
    x = 971.28

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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.