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Finding the Fourth Proportional to 1,078.48, 1,618 and 309.04

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Solution

The fourth proportional to 1,078.48, 1,618 and 309.04 is: 463.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.48 : 1,618 = 309.04 : x
  2. Step 2: Convert to fraction form
    1,078.48/1,618 = 309.04/x
  3. Step 3: Cross multiply
    1,078.48x = 1,618 × 309.04
  4. Step 4: Simplify right side
    1,078.48x = 500,026.72
  5. Step 5: Solve for x
    x = 500,026.72/1,078.48
  6. Step 6: Final answer
    x = 463.64

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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.