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Finding the Fourth Proportional to 946.21, 1,421.55 and 557.21

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Solution

The fourth proportional to 946.21, 1,421.55 and 557.21 is: 837.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.21 : 1,421.55 = 557.21 : x
  2. Step 2: Convert to fraction form
    946.21/1,421.55 = 557.21/x
  3. Step 3: Cross multiply
    946.21x = 1,421.55 × 557.21
  4. Step 4: Simplify right side
    946.21x = 792,099.09
  5. Step 5: Solve for x
    x = 792,099.09/946.21
  6. Step 6: Final answer
    x = 837.13

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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.