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Finding the Fourth Proportional to 919.79, 1,267.55 and 587.64

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Solution

The fourth proportional to 919.79, 1,267.55 and 587.64 is: 809.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.79 : 1,267.55 = 587.64 : x
  2. Step 2: Convert to fraction form
    919.79/1,267.55 = 587.64/x
  3. Step 3: Cross multiply
    919.79x = 1,267.55 × 587.64
  4. Step 4: Simplify right side
    919.79x = 744,865.32
  5. Step 5: Solve for x
    x = 744,865.32/919.79
  6. Step 6: Final answer
    x = 809.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.