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Finding the Fourth Proportional to 1,018, 1,401.75 and 870.31

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Solution

The fourth proportional to 1,018, 1,401.75 and 870.31 is: 1,198.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018 : 1,401.75 = 870.31 : x
  2. Step 2: Convert to fraction form
    1,018/1,401.75 = 870.31/x
  3. Step 3: Cross multiply
    1,018x = 1,401.75 × 870.31
  4. Step 4: Simplify right side
    1,018x = 1,219,957.04
  5. Step 5: Solve for x
    x = 1,219,957.04/1,018
  6. Step 6: Final answer
    x = 1,198.39

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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.