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Finding the Fourth Proportional to 920.16, 1,379.34 and 612.06

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Solution

The fourth proportional to 920.16, 1,379.34 and 612.06 is: 917.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.16 : 1,379.34 = 612.06 : x
  2. Step 2: Convert to fraction form
    920.16/1,379.34 = 612.06/x
  3. Step 3: Cross multiply
    920.16x = 1,379.34 × 612.06
  4. Step 4: Simplify right side
    920.16x = 844,238.84
  5. Step 5: Solve for x
    x = 844,238.84/920.16
  6. Step 6: Final answer
    x = 917.49

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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.