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Finding the Fourth Proportional to 947.72, 1,307.61 and 554.47

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Solution

The fourth proportional to 947.72, 1,307.61 and 554.47 is: 765.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.72 : 1,307.61 = 554.47 : x
  2. Step 2: Convert to fraction form
    947.72/1,307.61 = 554.47/x
  3. Step 3: Cross multiply
    947.72x = 1,307.61 × 554.47
  4. Step 4: Simplify right side
    947.72x = 725,027.25
  5. Step 5: Solve for x
    x = 725,027.25/947.72
  6. Step 6: Final answer
    x = 765.02

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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.