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Finding the Fourth Proportional to 1,015.68, 1,401.28 and 623.04

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Solution

The fourth proportional to 1,015.68, 1,401.28 and 623.04 is: 859.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.68 : 1,401.28 = 623.04 : x
  2. Step 2: Convert to fraction form
    1,015.68/1,401.28 = 623.04/x
  3. Step 3: Cross multiply
    1,015.68x = 1,401.28 × 623.04
  4. Step 4: Simplify right side
    1,015.68x = 873,053.49
  5. Step 5: Solve for x
    x = 873,053.49/1,015.68
  6. Step 6: Final answer
    x = 859.58

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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.