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Finding the Fourth Proportional to 1,323.10, 1,985.64 and 905.64

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Solution

The fourth proportional to 1,323.10, 1,985.64 and 905.64 is: 1,359.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.10 : 1,985.64 = 905.64 : x
  2. Step 2: Convert to fraction form
    1,323.10/1,985.64 = 905.64/x
  3. Step 3: Cross multiply
    1,323.10x = 1,985.64 × 905.64
  4. Step 4: Simplify right side
    1,323.10x = 1,798,275.01
  5. Step 5: Solve for x
    x = 1,798,275.01/1,323.10
  6. Step 6: Final answer
    x = 1,359.14

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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.