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Finding the Fourth Proportional to 505.70, 758.45 and 245.70

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Solution

The fourth proportional to 505.70, 758.45 and 245.70 is: 368.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.70 : 758.45 = 245.70 : x
  2. Step 2: Convert to fraction form
    505.70/758.45 = 245.70/x
  3. Step 3: Cross multiply
    505.70x = 758.45 × 245.70
  4. Step 4: Simplify right side
    505.70x = 186,351.17
  5. Step 5: Solve for x
    x = 186,351.17/505.70
  6. Step 6: Final answer
    x = 368.50

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Double scale
Find fourth proportional to 506.70, 759.95 and 246.70
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.