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Finding the Fourth Proportional to 918.68, 1,378.62 and 370.76

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Solution

The fourth proportional to 918.68, 1,378.62 and 370.76 is: 556.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.68 : 1,378.62 = 370.76 : x
  2. Step 2: Convert to fraction form
    918.68/1,378.62 = 370.76/x
  3. Step 3: Cross multiply
    918.68x = 1,378.62 × 370.76
  4. Step 4: Simplify right side
    918.68x = 511,137.15
  5. Step 5: Solve for x
    x = 511,137.15/918.68
  6. Step 6: Final answer
    x = 556.38

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Double scale
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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.