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Finding the Fourth Proportional to 839,809,219.20, 1,259,713,828.80 and 785,389,660.80

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Solution

The fourth proportional to 839,809,219.20, 1,259,713,828.80 and 785,389,660.80 is: 1,178,084,491.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,809,219.20 : 1,259,713,828.80 = 785,389,660.80 : x
  2. Step 2: Convert to fraction form
    839,809,219.20/1,259,713,828.80 = 785,389,660.80/x
  3. Step 3: Cross multiply
    839,809,219.20x = 1,259,713,828.80 × 785,389,660.80
  4. Step 4: Simplify right side
    839,809,219.20x = 989,366,216,706,301,184
  5. Step 5: Solve for x
    x = 989,366,216,706,301,184/839,809,219.20
  6. Step 6: Final answer
    x = 1,178,084,491.20

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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.