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Finding the Fourth Proportional to 391,394.47, 540,126.44 and 219,312.80

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Solution

The fourth proportional to 391,394.47, 540,126.44 and 219,312.80 is: 302,652.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,394.47 : 540,126.44 = 219,312.80 : x
  2. Step 2: Convert to fraction form
    391,394.47/540,126.44 = 219,312.80/x
  3. Step 3: Cross multiply
    391,394.47x = 540,126.44 × 219,312.80
  4. Step 4: Simplify right side
    391,394.47x = 118,456,641,910.43
  5. Step 5: Solve for x
    x = 118,456,641,910.43/391,394.47
  6. Step 6: Final answer
    x = 302,652.82

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1.5x scale

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.