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Finding the Fourth Proportional to 920.03, 1,380.42 and 555.08

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Solution

The fourth proportional to 920.03, 1,380.42 and 555.08 is: 832.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.03 : 1,380.42 = 555.08 : x
  2. Step 2: Convert to fraction form
    920.03/1,380.42 = 555.08/x
  3. Step 3: Cross multiply
    920.03x = 1,380.42 × 555.08
  4. Step 4: Simplify right side
    920.03x = 766,243.53
  5. Step 5: Solve for x
    x = 766,243.53/920.03
  6. Step 6: Final answer
    x = 832.85

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Half scale
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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.