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Finding the Fourth Proportional to 770.56, 1,063.38 and 421.25

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Solution

The fourth proportional to 770.56, 1,063.38 and 421.25 is: 581.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.56 : 1,063.38 = 421.25 : x
  2. Step 2: Convert to fraction form
    770.56/1,063.38 = 421.25/x
  3. Step 3: Cross multiply
    770.56x = 1,063.38 × 421.25
  4. Step 4: Simplify right side
    770.56x = 447,948.83
  5. Step 5: Solve for x
    x = 447,948.83/770.56
  6. Step 6: Final answer
    x = 581.33

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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.