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Finding the Fourth Proportional to 946.68, 1,420.29 and 621.66

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Solution

The fourth proportional to 946.68, 1,420.29 and 621.66 is: 932.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.68 : 1,420.29 = 621.66 : x
  2. Step 2: Convert to fraction form
    946.68/1,420.29 = 621.66/x
  3. Step 3: Cross multiply
    946.68x = 1,420.29 × 621.66
  4. Step 4: Simplify right side
    946.68x = 882,937.48
  5. Step 5: Solve for x
    x = 882,937.48/946.68
  6. Step 6: Final answer
    x = 932.67

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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.