Home / 811,284.60-1,216,811.70-278,830.20

Finding the Fourth Proportional to 811,284.60, 1,216,811.70 and 278,830.20

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Solution

The fourth proportional to 811,284.60, 1,216,811.70 and 278,830.20 is: 418,205.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,284.60 : 1,216,811.70 = 278,830.20 : x
  2. Step 2: Convert to fraction form
    811,284.60/1,216,811.70 = 278,830.20/x
  3. Step 3: Cross multiply
    811,284.60x = 1,216,811.70 × 278,830.20
  4. Step 4: Simplify right side
    811,284.60x = 339,283,849,673.34
  5. Step 5: Solve for x
    x = 339,283,849,673.34/811,284.60
  6. Step 6: Final answer
    x = 418,205.71

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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.