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Finding the Fourth Proportional to 1,431.45, 2,146.74 and 651

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Solution

The fourth proportional to 1,431.45, 2,146.74 and 651 is: 976.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.45 : 2,146.74 = 651 : x
  2. Step 2: Convert to fraction form
    1,431.45/2,146.74 = 651/x
  3. Step 3: Cross multiply
    1,431.45x = 2,146.74 × 651
  4. Step 4: Simplify right side
    1,431.45x = 1,397,527.74
  5. Step 5: Solve for x
    x = 1,397,527.74/1,431.45
  6. Step 6: Final answer
    x = 976.30

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Double scale
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1.5x scale

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.