Home / 811,285.60-1,216,813.20-278,831.20

Finding the Fourth Proportional to 811,285.60, 1,216,813.20 and 278,831.20

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Solution

The fourth proportional to 811,285.60, 1,216,813.20 and 278,831.20 is: 418,207.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,285.60 : 1,216,813.20 = 278,831.20 : x
  2. Step 2: Convert to fraction form
    811,285.60/1,216,813.20 = 278,831.20/x
  3. Step 3: Cross multiply
    811,285.60x = 1,216,813.20 × 278,831.20
  4. Step 4: Simplify right side
    811,285.60x = 339,285,484,731.84
  5. Step 5: Solve for x
    x = 339,285,484,731.84/811,285.60
  6. Step 6: Final answer
    x = 418,207.21

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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.