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Finding the Fourth Proportional to 1,015.58, 1,401.06 and 684.20

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Solution

The fourth proportional to 1,015.58, 1,401.06 and 684.20 is: 943.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.58 : 1,401.06 = 684.20 : x
  2. Step 2: Convert to fraction form
    1,015.58/1,401.06 = 684.20/x
  3. Step 3: Cross multiply
    1,015.58x = 1,401.06 × 684.20
  4. Step 4: Simplify right side
    1,015.58x = 958,605.25
  5. Step 5: Solve for x
    x = 958,605.25/1,015.58
  6. Step 6: Final answer
    x = 943.90

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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.