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Finding the Fourth Proportional to 1,442.68, 2,161.30 and 711.40

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Solution

The fourth proportional to 1,442.68, 2,161.30 and 711.40 is: 1,065.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.68 : 2,161.30 = 711.40 : x
  2. Step 2: Convert to fraction form
    1,442.68/2,161.30 = 711.40/x
  3. Step 3: Cross multiply
    1,442.68x = 2,161.30 × 711.40
  4. Step 4: Simplify right side
    1,442.68x = 1,537,548.82
  5. Step 5: Solve for x
    x = 1,537,548.82/1,442.68
  6. Step 6: Final answer
    x = 1,065.76

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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.