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Finding the Fourth Proportional to 652.15, 978.63 and 287.25

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Solution

The fourth proportional to 652.15, 978.63 and 287.25 is: 431.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.15 : 978.63 = 287.25 : x
  2. Step 2: Convert to fraction form
    652.15/978.63 = 287.25/x
  3. Step 3: Cross multiply
    652.15x = 978.63 × 287.25
  4. Step 4: Simplify right side
    652.15x = 281,111.47
  5. Step 5: Solve for x
    x = 281,111.47/652.15
  6. Step 6: Final answer
    x = 431.05

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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.