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Finding the Fourth Proportional to 1,431.79, 2,148.96 and 774.19

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Solution

The fourth proportional to 1,431.79, 2,148.96 and 774.19 is: 1,161.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.79 : 2,148.96 = 774.19 : x
  2. Step 2: Convert to fraction form
    1,431.79/2,148.96 = 774.19/x
  3. Step 3: Cross multiply
    1,431.79x = 2,148.96 × 774.19
  4. Step 4: Simplify right side
    1,431.79x = 1,663,703.34
  5. Step 5: Solve for x
    x = 1,663,703.34/1,431.79
  6. Step 6: Final answer
    x = 1,161.97

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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.