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Finding the Fourth Proportional to 647,391.30, 971,378.55 and 310,301.70

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Solution

The fourth proportional to 647,391.30, 971,378.55 and 310,301.70 is: 465,592.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,391.30 : 971,378.55 = 310,301.70 : x
  2. Step 2: Convert to fraction form
    647,391.30/971,378.55 = 310,301.70/x
  3. Step 3: Cross multiply
    647,391.30x = 971,378.55 × 310,301.70
  4. Step 4: Simplify right side
    647,391.30x = 301,420,415,408.54
  5. Step 5: Solve for x
    x = 301,420,415,408.54/647,391.30
  6. Step 6: Final answer
    x = 465,592.32

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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.