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Finding the Fourth Proportional to 391,715.60, 587,570.79 and 189,075.18

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Solution

The fourth proportional to 391,715.60, 587,570.79 and 189,075.18 is: 283,611.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,715.60 : 587,570.79 = 189,075.18 : x
  2. Step 2: Convert to fraction form
    391,715.60/587,570.79 = 189,075.18/x
  3. Step 3: Cross multiply
    391,715.60x = 587,570.79 × 189,075.18
  4. Step 4: Simplify right side
    391,715.60x = 111,095,052,881.99
  5. Step 5: Solve for x
    x = 111,095,052,881.99/391,715.60
  6. Step 6: Final answer
    x = 283,611.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.