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Finding the Fourth Proportional to 947.58, 1,422.97 and 619.08

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Solution

The fourth proportional to 947.58, 1,422.97 and 619.08 is: 929.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.58 : 1,422.97 = 619.08 : x
  2. Step 2: Convert to fraction form
    947.58/1,422.97 = 619.08/x
  3. Step 3: Cross multiply
    947.58x = 1,422.97 × 619.08
  4. Step 4: Simplify right side
    947.58x = 880,929.95
  5. Step 5: Solve for x
    x = 880,929.95/947.58
  6. Step 6: Final answer
    x = 929.66

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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.