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Finding the Fourth Proportional to 391,317.48, 539,738.64 and 359,156.43

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Solution

The fourth proportional to 391,317.48, 539,738.64 and 359,156.43 is: 495,379.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,317.48 : 539,738.64 = 359,156.43 : x
  2. Step 2: Convert to fraction form
    391,317.48/539,738.64 = 359,156.43/x
  3. Step 3: Cross multiply
    391,317.48x = 539,738.64 × 359,156.43
  4. Step 4: Simplify right side
    391,317.48x = 193,850,603,075.46
  5. Step 5: Solve for x
    x = 193,850,603,075.46/391,317.48
  6. Step 6: Final answer
    x = 495,379.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.