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Finding the Fourth Proportional to 70,075.86, 105,131.54 and 20,154.88

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Solution

The fourth proportional to 70,075.86, 105,131.54 and 20,154.88 is: 30,237.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,075.86 : 105,131.54 = 20,154.88 : x
  2. Step 2: Convert to fraction form
    70,075.86/105,131.54 = 20,154.88/x
  3. Step 3: Cross multiply
    70,075.86x = 105,131.54 × 20,154.88
  4. Step 4: Simplify right side
    70,075.86x = 2,118,913,472.14
  5. Step 5: Solve for x
    x = 2,118,913,472.14/70,075.86
  6. Step 6: Final answer
    x = 30,237.43

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1.5x scale

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.