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Finding the Fourth Proportional to 774.48, 1,069.74 and 578.64

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Solution

The fourth proportional to 774.48, 1,069.74 and 578.64 is: 799.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.48 : 1,069.74 = 578.64 : x
  2. Step 2: Convert to fraction form
    774.48/1,069.74 = 578.64/x
  3. Step 3: Cross multiply
    774.48x = 1,069.74 × 578.64
  4. Step 4: Simplify right side
    774.48x = 618,994.35
  5. Step 5: Solve for x
    x = 618,994.35/774.48
  6. Step 6: Final answer
    x = 799.24

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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.