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Finding the Fourth Proportional to 939.27, 1,408.94 and 476.93

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Solution

The fourth proportional to 939.27, 1,408.94 and 476.93 is: 715.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.27 : 1,408.94 = 476.93 : x
  2. Step 2: Convert to fraction form
    939.27/1,408.94 = 476.93/x
  3. Step 3: Cross multiply
    939.27x = 1,408.94 × 476.93
  4. Step 4: Simplify right side
    939.27x = 671,956.32
  5. Step 5: Solve for x
    x = 671,956.32/939.27
  6. Step 6: Final answer
    x = 715.40

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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.