Home / 391,156.09-539,702.89-221,390.21

Finding the Fourth Proportional to 391,156.09, 539,702.89 and 221,390.21

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Solution

The fourth proportional to 391,156.09, 539,702.89 and 221,390.21 is: 305,466.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,156.09 : 539,702.89 = 221,390.21 : x
  2. Step 2: Convert to fraction form
    391,156.09/539,702.89 = 221,390.21/x
  3. Step 3: Cross multiply
    391,156.09x = 539,702.89 × 221,390.21
  4. Step 4: Simplify right side
    391,156.09x = 119,484,936,950.49
  5. Step 5: Solve for x
    x = 119,484,936,950.49/391,156.09
  6. Step 6: Final answer
    x = 305,466.13

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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.