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Finding the Fourth Proportional to 978.08, 1,348.99 and 584.69

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Solution

The fourth proportional to 978.08, 1,348.99 and 584.69 is: 806.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.08 : 1,348.99 = 584.69 : x
  2. Step 2: Convert to fraction form
    978.08/1,348.99 = 584.69/x
  3. Step 3: Cross multiply
    978.08x = 1,348.99 × 584.69
  4. Step 4: Simplify right side
    978.08x = 788,732.76
  5. Step 5: Solve for x
    x = 788,732.76/978.08
  6. Step 6: Final answer
    x = 806.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.