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Finding the Fourth Proportional to 1,516.40, 2,275.92 and 786.40

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Solution

The fourth proportional to 1,516.40, 2,275.92 and 786.40 is: 1,180.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,516.40 : 2,275.92 = 786.40 : x
  2. Step 2: Convert to fraction form
    1,516.40/2,275.92 = 786.40/x
  3. Step 3: Cross multiply
    1,516.40x = 2,275.92 × 786.40
  4. Step 4: Simplify right side
    1,516.40x = 1,789,783.49
  5. Step 5: Solve for x
    x = 1,789,783.49/1,516.40
  6. Step 6: Final answer
    x = 1,180.28

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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.