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Finding the Fourth Proportional to 990.72, 1,485.60 and 557.76

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Solution

The fourth proportional to 990.72, 1,485.60 and 557.76 is: 836.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.72 : 1,485.60 = 557.76 : x
  2. Step 2: Convert to fraction form
    990.72/1,485.60 = 557.76/x
  3. Step 3: Cross multiply
    990.72x = 1,485.60 × 557.76
  4. Step 4: Simplify right side
    990.72x = 828,608.26
  5. Step 5: Solve for x
    x = 828,608.26/990.72
  6. Step 6: Final answer
    x = 836.37

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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.