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Finding the Fourth Proportional to 990.84, 1,485.83 and 528.51

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Solution

The fourth proportional to 990.84, 1,485.83 and 528.51 is: 792.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.84 : 1,485.83 = 528.51 : x
  2. Step 2: Convert to fraction form
    990.84/1,485.83 = 528.51/x
  3. Step 3: Cross multiply
    990.84x = 1,485.83 × 528.51
  4. Step 4: Simplify right side
    990.84x = 785,279.93
  5. Step 5: Solve for x
    x = 785,279.93/990.84
  6. Step 6: Final answer
    x = 792.54

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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.