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Finding the Fourth Proportional to 919.95, 1,269.20 and 521.56

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Solution

The fourth proportional to 919.95, 1,269.20 and 521.56 is: 719.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.95 : 1,269.20 = 521.56 : x
  2. Step 2: Convert to fraction form
    919.95/1,269.20 = 521.56/x
  3. Step 3: Cross multiply
    919.95x = 1,269.20 × 521.56
  4. Step 4: Simplify right side
    919.95x = 661,966.84
  5. Step 5: Solve for x
    x = 661,966.84/919.95
  6. Step 6: Final answer
    x = 719.57

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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.