Home / 420,868.80-631,303.20-105,325.20

Finding the Fourth Proportional to 420,868.80, 631,303.20 and 105,325.20

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Solution

The fourth proportional to 420,868.80, 631,303.20 and 105,325.20 is: 157,987.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,868.80 : 631,303.20 = 105,325.20 : x
  2. Step 2: Convert to fraction form
    420,868.80/631,303.20 = 105,325.20/x
  3. Step 3: Cross multiply
    420,868.80x = 631,303.20 × 105,325.20
  4. Step 4: Simplify right side
    420,868.80x = 66,492,135,800.64
  5. Step 5: Solve for x
    x = 66,492,135,800.64/420,868.80
  6. Step 6: Final answer
    x = 157,987.80

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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.