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Finding the Fourth Proportional to 391,307.87, 540,018.20 and 219,233.09

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Solution

The fourth proportional to 391,307.87, 540,018.20 and 219,233.09 is: 302,549.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,307.87 : 540,018.20 = 219,233.09 : x
  2. Step 2: Convert to fraction form
    391,307.87/540,018.20 = 219,233.09/x
  3. Step 3: Cross multiply
    391,307.87x = 540,018.20 × 219,233.09
  4. Step 4: Simplify right side
    391,307.87x = 118,389,856,490.23
  5. Step 5: Solve for x
    x = 118,389,856,490.23/391,307.87
  6. Step 6: Final answer
    x = 302,549.14

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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.