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Finding the Fourth Proportional to 770.39, 1,155.59 and 360.33

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Solution

The fourth proportional to 770.39, 1,155.59 and 360.33 is: 540.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.39 : 1,155.59 = 360.33 : x
  2. Step 2: Convert to fraction form
    770.39/1,155.59 = 360.33/x
  3. Step 3: Cross multiply
    770.39x = 1,155.59 × 360.33
  4. Step 4: Simplify right side
    770.39x = 416,393.74
  5. Step 5: Solve for x
    x = 416,393.74/770.39
  6. Step 6: Final answer
    x = 540.50

Related Problems

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Half scale
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Double scale
Find fourth proportional to 771.39, 1,157.09 and 361.33
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.