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Finding the Fourth Proportional to 1,259.64, 1,886.72 and 609

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Solution

The fourth proportional to 1,259.64, 1,886.72 and 609 is: 912.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.64 : 1,886.72 = 609 : x
  2. Step 2: Convert to fraction form
    1,259.64/1,886.72 = 609/x
  3. Step 3: Cross multiply
    1,259.64x = 1,886.72 × 609
  4. Step 4: Simplify right side
    1,259.64x = 1,149,009.44
  5. Step 5: Solve for x
    x = 1,149,009.44/1,259.64
  6. Step 6: Final answer
    x = 912.18

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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.