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Finding the Fourth Proportional to 955.18, 1,431.93 and 492.72

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Solution

The fourth proportional to 955.18, 1,431.93 and 492.72 is: 738.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.18 : 1,431.93 = 492.72 : x
  2. Step 2: Convert to fraction form
    955.18/1,431.93 = 492.72/x
  3. Step 3: Cross multiply
    955.18x = 1,431.93 × 492.72
  4. Step 4: Simplify right side
    955.18x = 705,534.26
  5. Step 5: Solve for x
    x = 705,534.26/955.18
  6. Step 6: Final answer
    x = 738.64

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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.