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Finding the Fourth Proportional to 391,365.78, 540,075.09 and 219,290.82

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Solution

The fourth proportional to 391,365.78, 540,075.09 and 219,290.82 is: 302,615.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,365.78 : 540,075.09 = 219,290.82 : x
  2. Step 2: Convert to fraction form
    391,365.78/540,075.09 = 219,290.82/x
  3. Step 3: Cross multiply
    391,365.78x = 540,075.09 × 219,290.82
  4. Step 4: Simplify right side
    391,365.78x = 118,433,509,347.67
  5. Step 5: Solve for x
    x = 118,433,509,347.67/391,365.78
  6. Step 6: Final answer
    x = 302,615.90

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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.