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Finding the Fourth Proportional to 978.21, 1,467.14 and 284.72

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Solution

The fourth proportional to 978.21, 1,467.14 and 284.72 is: 427.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.21 : 1,467.14 = 284.72 : x
  2. Step 2: Convert to fraction form
    978.21/1,467.14 = 284.72/x
  3. Step 3: Cross multiply
    978.21x = 1,467.14 × 284.72
  4. Step 4: Simplify right side
    978.21x = 417,715.34
  5. Step 5: Solve for x
    x = 417,715.34/978.21
  6. Step 6: Final answer
    x = 427.02

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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.