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Finding the Fourth Proportional to 978.84, 1,467.22 and 458.40

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Solution

The fourth proportional to 978.84, 1,467.22 and 458.40 is: 687.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.84 : 1,467.22 = 458.40 : x
  2. Step 2: Convert to fraction form
    978.84/1,467.22 = 458.40/x
  3. Step 3: Cross multiply
    978.84x = 1,467.22 × 458.40
  4. Step 4: Simplify right side
    978.84x = 672,571.36
  5. Step 5: Solve for x
    x = 672,571.36/978.84
  6. Step 6: Final answer
    x = 687.11

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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.