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Finding the Fourth Proportional to 768.48, 1,059.60 and 558.24

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Solution

The fourth proportional to 768.48, 1,059.60 and 558.24 is: 769.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.48 : 1,059.60 = 558.24 : x
  2. Step 2: Convert to fraction form
    768.48/1,059.60 = 558.24/x
  3. Step 3: Cross multiply
    768.48x = 1,059.60 × 558.24
  4. Step 4: Simplify right side
    768.48x = 591,511.10
  5. Step 5: Solve for x
    x = 591,511.10/768.48
  6. Step 6: Final answer
    x = 769.72

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1.5x scale

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.