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Finding the Fourth Proportional to 1,078.72, 1,618.08 and 992.32

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Solution

The fourth proportional to 1,078.72, 1,618.08 and 992.32 is: 1,488.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.72 : 1,618.08 = 992.32 : x
  2. Step 2: Convert to fraction form
    1,078.72/1,618.08 = 992.32/x
  3. Step 3: Cross multiply
    1,078.72x = 1,618.08 × 992.32
  4. Step 4: Simplify right side
    1,078.72x = 1,605,653.15
  5. Step 5: Solve for x
    x = 1,605,653.15/1,078.72
  6. Step 6: Final answer
    x = 1,488.48

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1.5x scale

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.