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Finding the Fourth Proportional to 1,431.91, 2,147.94 and 507.57

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Solution

The fourth proportional to 1,431.91, 2,147.94 and 507.57 is: 761.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.91 : 2,147.94 = 507.57 : x
  2. Step 2: Convert to fraction form
    1,431.91/2,147.94 = 507.57/x
  3. Step 3: Cross multiply
    1,431.91x = 2,147.94 × 507.57
  4. Step 4: Simplify right side
    1,431.91x = 1,090,223.28
  5. Step 5: Solve for x
    x = 1,090,223.28/1,431.91
  6. Step 6: Final answer
    x = 761.38

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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.