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Finding the Fourth Proportional to 622.75, 859.40 and 346.75

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Solution

The fourth proportional to 622.75, 859.40 and 346.75 is: 478.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.75 : 859.40 = 346.75 : x
  2. Step 2: Convert to fraction form
    622.75/859.40 = 346.75/x
  3. Step 3: Cross multiply
    622.75x = 859.40 × 346.75
  4. Step 4: Simplify right side
    622.75x = 297,996.95
  5. Step 5: Solve for x
    x = 297,996.95/622.75
  6. Step 6: Final answer
    x = 478.52

Related Problems

Find fourth proportional to 311.38, 429.70 and 173.38
Half scale
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Double scale
Find fourth proportional to 623.75, 860.78 and 347.75
Similar ratio
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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.