Home / 641,815.12-885,700.20-387,306.64

Finding the Fourth Proportional to 641,815.12, 885,700.20 and 387,306.64

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Solution

The fourth proportional to 641,815.12, 885,700.20 and 387,306.64 is: 534,480.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,815.12 : 885,700.20 = 387,306.64 : x
  2. Step 2: Convert to fraction form
    641,815.12/885,700.20 = 387,306.64/x
  3. Step 3: Cross multiply
    641,815.12x = 885,700.20 × 387,306.64
  4. Step 4: Simplify right side
    641,815.12x = 343,037,568,509.33
  5. Step 5: Solve for x
    x = 343,037,568,509.33/641,815.12
  6. Step 6: Final answer
    x = 534,480.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.