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Finding the Fourth Proportional to 1,578.61, 2,178.69 and 906.67

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Solution

The fourth proportional to 1,578.61, 2,178.69 and 906.67 is: 1,251.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.61 : 2,178.69 = 906.67 : x
  2. Step 2: Convert to fraction form
    1,578.61/2,178.69 = 906.67/x
  3. Step 3: Cross multiply
    1,578.61x = 2,178.69 × 906.67
  4. Step 4: Simplify right side
    1,578.61x = 1,975,348.33
  5. Step 5: Solve for x
    x = 1,975,348.33/1,578.61
  6. Step 6: Final answer
    x = 1,251.32

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1.5x scale

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.