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Finding the Fourth Proportional to 1,054, 1,581.45 and 404.65

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Solution

The fourth proportional to 1,054, 1,581.45 and 404.65 is: 607.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,054 : 1,581.45 = 404.65 : x
  2. Step 2: Convert to fraction form
    1,054/1,581.45 = 404.65/x
  3. Step 3: Cross multiply
    1,054x = 1,581.45 × 404.65
  4. Step 4: Simplify right side
    1,054x = 639,933.74
  5. Step 5: Solve for x
    x = 639,933.74/1,054
  6. Step 6: Final answer
    x = 607.15

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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.