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Finding the Fourth Proportional to 946.88, 1,420.80 and 459.86

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Solution

The fourth proportional to 946.88, 1,420.80 and 459.86 is: 690.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.88 : 1,420.80 = 459.86 : x
  2. Step 2: Convert to fraction form
    946.88/1,420.80 = 459.86/x
  3. Step 3: Cross multiply
    946.88x = 1,420.80 × 459.86
  4. Step 4: Simplify right side
    946.88x = 653,369.09
  5. Step 5: Solve for x
    x = 653,369.09/946.88
  6. Step 6: Final answer
    x = 690.02

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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.