Home / 811,209.21-1,216,720.85-212,228.17

Finding the Fourth Proportional to 811,209.21, 1,216,720.85 and 212,228.17

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Solution

The fourth proportional to 811,209.21, 1,216,720.85 and 212,228.17 is: 318,317.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,209.21 : 1,216,720.85 = 212,228.17 : x
  2. Step 2: Convert to fraction form
    811,209.21/1,216,720.85 = 212,228.17/x
  3. Step 3: Cross multiply
    811,209.21x = 1,216,720.85 × 212,228.17
  4. Step 4: Simplify right side
    811,209.21x = 258,222,439,396.35
  5. Step 5: Solve for x
    x = 258,222,439,396.35/811,209.21
  6. Step 6: Final answer
    x = 318,317.93

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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.