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Finding the Fourth Proportional to 770.36, 1,063.11 and 438.77

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Solution

The fourth proportional to 770.36, 1,063.11 and 438.77 is: 605.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.36 : 1,063.11 = 438.77 : x
  2. Step 2: Convert to fraction form
    770.36/1,063.11 = 438.77/x
  3. Step 3: Cross multiply
    770.36x = 1,063.11 × 438.77
  4. Step 4: Simplify right side
    770.36x = 466,461.09
  5. Step 5: Solve for x
    x = 466,461.09/770.36
  6. Step 6: Final answer
    x = 605.51

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Double scale
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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.