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Finding the Fourth Proportional to 954.72, 1,317.14 and 561.60

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Solution

The fourth proportional to 954.72, 1,317.14 and 561.60 is: 774.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.72 : 1,317.14 = 561.60 : x
  2. Step 2: Convert to fraction form
    954.72/1,317.14 = 561.60/x
  3. Step 3: Cross multiply
    954.72x = 1,317.14 × 561.60
  4. Step 4: Simplify right side
    954.72x = 739,705.82
  5. Step 5: Solve for x
    x = 739,705.82/954.72
  6. Step 6: Final answer
    x = 774.79

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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.