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Finding the Fourth Proportional to 1,018.72, 1,527 and 744.40

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Solution

The fourth proportional to 1,018.72, 1,527 and 744.40 is: 1,115.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.72 : 1,527 = 744.40 : x
  2. Step 2: Convert to fraction form
    1,018.72/1,527 = 744.40/x
  3. Step 3: Cross multiply
    1,018.72x = 1,527 × 744.40
  4. Step 4: Simplify right side
    1,018.72x = 1,136,698.80
  5. Step 5: Solve for x
    x = 1,136,698.80/1,018.72
  6. Step 6: Final answer
    x = 1,115.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.