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Finding the Fourth Proportional to 455,919.80, 639,687.40 and 455,919.80

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Solution

The fourth proportional to 455,919.80, 639,687.40 and 455,919.80 is: 639,687.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,919.80 : 639,687.40 = 455,919.80 : x
  2. Step 2: Convert to fraction form
    455,919.80/639,687.40 = 455,919.80/x
  3. Step 3: Cross multiply
    455,919.80x = 639,687.40 × 455,919.80
  4. Step 4: Simplify right side
    455,919.80x = 291,646,151,470.52
  5. Step 5: Solve for x
    x = 291,646,151,470.52/455,919.80
  6. Step 6: Final answer
    x = 639,687.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.