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Finding the Fourth Proportional to 955.14, 1,431.60 and 782.10

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Solution

The fourth proportional to 955.14, 1,431.60 and 782.10 is: 1,172.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.14 : 1,431.60 = 782.10 : x
  2. Step 2: Convert to fraction form
    955.14/1,431.60 = 782.10/x
  3. Step 3: Cross multiply
    955.14x = 1,431.60 × 782.10
  4. Step 4: Simplify right side
    955.14x = 1,119,654.36
  5. Step 5: Solve for x
    x = 1,119,654.36/955.14
  6. Step 6: Final answer
    x = 1,172.24

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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.