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Finding the Fourth Proportional to 955.48, 1,431.30 and 810.20

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Solution

The fourth proportional to 955.48, 1,431.30 and 810.20 is: 1,213.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.48 : 1,431.30 = 810.20 : x
  2. Step 2: Convert to fraction form
    955.48/1,431.30 = 810.20/x
  3. Step 3: Cross multiply
    955.48x = 1,431.30 × 810.20
  4. Step 4: Simplify right side
    955.48x = 1,159,639.26
  5. Step 5: Solve for x
    x = 1,159,639.26/955.48
  6. Step 6: Final answer
    x = 1,213.67

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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.