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Finding the Fourth Proportional to 1,409.63, 2,115.52 and 760.55

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Solution

The fourth proportional to 1,409.63, 2,115.52 and 760.55 is: 1,141.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.63 : 2,115.52 = 760.55 : x
  2. Step 2: Convert to fraction form
    1,409.63/2,115.52 = 760.55/x
  3. Step 3: Cross multiply
    1,409.63x = 2,115.52 × 760.55
  4. Step 4: Simplify right side
    1,409.63x = 1,608,946.26
  5. Step 5: Solve for x
    x = 1,608,946.26/1,409.63
  6. Step 6: Final answer
    x = 1,141.40

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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.