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Finding the Fourth Proportional to 955.30, 1,431.87 and 607.78

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Solution

The fourth proportional to 955.30, 1,431.87 and 607.78 is: 910.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.30 : 1,431.87 = 607.78 : x
  2. Step 2: Convert to fraction form
    955.30/1,431.87 = 607.78/x
  3. Step 3: Cross multiply
    955.30x = 1,431.87 × 607.78
  4. Step 4: Simplify right side
    955.30x = 870,261.95
  5. Step 5: Solve for x
    x = 870,261.95/955.30
  6. Step 6: Final answer
    x = 910.98

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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.