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Finding the Fourth Proportional to 990.52, 1,485.72 and 260.08

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Solution

The fourth proportional to 990.52, 1,485.72 and 260.08 is: 390.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.52 : 1,485.72 = 260.08 : x
  2. Step 2: Convert to fraction form
    990.52/1,485.72 = 260.08/x
  3. Step 3: Cross multiply
    990.52x = 1,485.72 × 260.08
  4. Step 4: Simplify right side
    990.52x = 386,406.06
  5. Step 5: Solve for x
    x = 386,406.06/990.52
  6. Step 6: Final answer
    x = 390.10

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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.