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Finding the Fourth Proportional to 1,431.81, 2,145.88 and 609.86

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Solution

The fourth proportional to 1,431.81, 2,145.88 and 609.86 is: 914.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.81 : 2,145.88 = 609.86 : x
  2. Step 2: Convert to fraction form
    1,431.81/2,145.88 = 609.86/x
  3. Step 3: Cross multiply
    1,431.81x = 2,145.88 × 609.86
  4. Step 4: Simplify right side
    1,431.81x = 1,308,686.38
  5. Step 5: Solve for x
    x = 1,308,686.38/1,431.81
  6. Step 6: Final answer
    x = 914.01

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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.