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Finding the Fourth Proportional to 990.37, 1,485.57 and 260.05

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Solution

The fourth proportional to 990.37, 1,485.57 and 260.05 is: 390.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.37 : 1,485.57 = 260.05 : x
  2. Step 2: Convert to fraction form
    990.37/1,485.57 = 260.05/x
  3. Step 3: Cross multiply
    990.37x = 1,485.57 × 260.05
  4. Step 4: Simplify right side
    990.37x = 386,322.48
  5. Step 5: Solve for x
    x = 386,322.48/990.37
  6. Step 6: Final answer
    x = 390.08

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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.