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Finding the Fourth Proportional to 978.89, 1,467.53 and 458.63

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Solution

The fourth proportional to 978.89, 1,467.53 and 458.63 is: 687.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.89 : 1,467.53 = 458.63 : x
  2. Step 2: Convert to fraction form
    978.89/1,467.53 = 458.63/x
  3. Step 3: Cross multiply
    978.89x = 1,467.53 × 458.63
  4. Step 4: Simplify right side
    978.89x = 673,054.66
  5. Step 5: Solve for x
    x = 673,054.66/978.89
  6. Step 6: Final answer
    x = 687.57

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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.