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Finding the Fourth Proportional to 778.96, 1,074.40 and 529.84

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Solution

The fourth proportional to 778.96, 1,074.40 and 529.84 is: 730.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.96 : 1,074.40 = 529.84 : x
  2. Step 2: Convert to fraction form
    778.96/1,074.40 = 529.84/x
  3. Step 3: Cross multiply
    778.96x = 1,074.40 × 529.84
  4. Step 4: Simplify right side
    778.96x = 569,260.10
  5. Step 5: Solve for x
    x = 569,260.10/778.96
  6. Step 6: Final answer
    x = 730.80

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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.