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Finding the Fourth Proportional to 990.24, 1,485.68 and 904.48

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Solution

The fourth proportional to 990.24, 1,485.68 and 904.48 is: 1,357.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.24 : 1,485.68 = 904.48 : x
  2. Step 2: Convert to fraction form
    990.24/1,485.68 = 904.48/x
  3. Step 3: Cross multiply
    990.24x = 1,485.68 × 904.48
  4. Step 4: Simplify right side
    990.24x = 1,343,767.85
  5. Step 5: Solve for x
    x = 1,343,767.85/990.24
  6. Step 6: Final answer
    x = 1,357.01

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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.