Home / 820,320,983.40-1,230,481,475.10-390,339,287.40

Finding the Fourth Proportional to 820,320,983.40, 1,230,481,475.10 and 390,339,287.40

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Solution

The fourth proportional to 820,320,983.40, 1,230,481,475.10 and 390,339,287.40 is: 585,508,931.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,320,983.40 : 1,230,481,475.10 = 390,339,287.40 : x
  2. Step 2: Convert to fraction form
    820,320,983.40/1,230,481,475.10 = 390,339,287.40/x
  3. Step 3: Cross multiply
    820,320,983.40x = 1,230,481,475.10 × 390,339,287.40
  4. Step 4: Simplify right side
    820,320,983.40x = 480,305,262,149,434,752
  5. Step 5: Solve for x
    x = 480,305,262,149,434,752/820,320,983.40
  6. Step 6: Final answer
    x = 585,508,931.10

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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.