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Finding the Fourth Proportional to 210,021.60, 315,075.60 and 69,880.80

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Solution

The fourth proportional to 210,021.60, 315,075.60 and 69,880.80 is: 104,835.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,021.60 : 315,075.60 = 69,880.80 : x
  2. Step 2: Convert to fraction form
    210,021.60/315,075.60 = 69,880.80/x
  3. Step 3: Cross multiply
    210,021.60x = 315,075.60 × 69,880.80
  4. Step 4: Simplify right side
    210,021.60x = 22,017,734,988.48
  5. Step 5: Solve for x
    x = 22,017,734,988.48/210,021.60
  6. Step 6: Final answer
    x = 104,835.57

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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.