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Finding the Fourth Proportional to 947.74, 1,307.90 and 574.78

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Solution

The fourth proportional to 947.74, 1,307.90 and 574.78 is: 793.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.74 : 1,307.90 = 574.78 : x
  2. Step 2: Convert to fraction form
    947.74/1,307.90 = 574.78/x
  3. Step 3: Cross multiply
    947.74x = 1,307.90 × 574.78
  4. Step 4: Simplify right side
    947.74x = 751,754.76
  5. Step 5: Solve for x
    x = 751,754.76/947.74
  6. Step 6: Final answer
    x = 793.21

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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.