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Finding the Fourth Proportional to 1,006.93, 1,509.78 and 920.99

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Solution

The fourth proportional to 1,006.93, 1,509.78 and 920.99 is: 1,380.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.93 : 1,509.78 = 920.99 : x
  2. Step 2: Convert to fraction form
    1,006.93/1,509.78 = 920.99/x
  3. Step 3: Cross multiply
    1,006.93x = 1,509.78 × 920.99
  4. Step 4: Simplify right side
    1,006.93x = 1,390,480.13
  5. Step 5: Solve for x
    x = 1,390,480.13/1,006.93
  6. Step 6: Final answer
    x = 1,380.91

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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.