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Finding the Fourth Proportional to 2,431.23, 3,645.95 and 870.81

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Solution

The fourth proportional to 2,431.23, 3,645.95 and 870.81 is: 1,305.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,431.23 : 3,645.95 = 870.81 : x
  2. Step 2: Convert to fraction form
    2,431.23/3,645.95 = 870.81/x
  3. Step 3: Cross multiply
    2,431.23x = 3,645.95 × 870.81
  4. Step 4: Simplify right side
    2,431.23x = 3,174,929.72
  5. Step 5: Solve for x
    x = 3,174,929.72/2,431.23
  6. Step 6: Final answer
    x = 1,305.89

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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.