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Finding the Fourth Proportional to 955.07, 1,430.78 and 645.40

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Solution

The fourth proportional to 955.07, 1,430.78 and 645.40 is: 966.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.07 : 1,430.78 = 645.40 : x
  2. Step 2: Convert to fraction form
    955.07/1,430.78 = 645.40/x
  3. Step 3: Cross multiply
    955.07x = 1,430.78 × 645.40
  4. Step 4: Simplify right side
    955.07x = 923,423.97
  5. Step 5: Solve for x
    x = 923,423.97/955.07
  6. Step 6: Final answer
    x = 966.87

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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.