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Finding the Fourth Proportional to 1,018.71, 1,404.42 and 699.67

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Solution

The fourth proportional to 1,018.71, 1,404.42 and 699.67 is: 964.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.71 : 1,404.42 = 699.67 : x
  2. Step 2: Convert to fraction form
    1,018.71/1,404.42 = 699.67/x
  3. Step 3: Cross multiply
    1,018.71x = 1,404.42 × 699.67
  4. Step 4: Simplify right side
    1,018.71x = 982,623.52
  5. Step 5: Solve for x
    x = 982,623.52/1,018.71
  6. Step 6: Final answer
    x = 964.58

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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.