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Finding the Fourth Proportional to 919.55, 1,268.98 and 526.58

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Solution

The fourth proportional to 919.55, 1,268.98 and 526.58 is: 726.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.55 : 1,268.98 = 526.58 : x
  2. Step 2: Convert to fraction form
    919.55/1,268.98 = 526.58/x
  3. Step 3: Cross multiply
    919.55x = 1,268.98 × 526.58
  4. Step 4: Simplify right side
    919.55x = 668,219.49
  5. Step 5: Solve for x
    x = 668,219.49/919.55
  6. Step 6: Final answer
    x = 726.68

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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.