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Finding the Fourth Proportional to 774.68, 1,069.08 and 425.40

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Solution

The fourth proportional to 774.68, 1,069.08 and 425.40 is: 587.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.68 : 1,069.08 = 425.40 : x
  2. Step 2: Convert to fraction form
    774.68/1,069.08 = 425.40/x
  3. Step 3: Cross multiply
    774.68x = 1,069.08 × 425.40
  4. Step 4: Simplify right side
    774.68x = 454,786.63
  5. Step 5: Solve for x
    x = 454,786.63/774.68
  6. Step 6: Final answer
    x = 587.06

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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.