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Finding the Fourth Proportional to 946.08, 1,420.74 and 657.72

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Solution

The fourth proportional to 946.08, 1,420.74 and 657.72 is: 987.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.08 : 1,420.74 = 657.72 : x
  2. Step 2: Convert to fraction form
    946.08/1,420.74 = 657.72/x
  3. Step 3: Cross multiply
    946.08x = 1,420.74 × 657.72
  4. Step 4: Simplify right side
    946.08x = 934,449.11
  5. Step 5: Solve for x
    x = 934,449.11/946.08
  6. Step 6: Final answer
    x = 987.71

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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.