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Finding the Fourth Proportional to 455,145.20, 638,136.40 and 455,145.20

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Solution

The fourth proportional to 455,145.20, 638,136.40 and 455,145.20 is: 638,136.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,145.20 : 638,136.40 = 455,145.20 : x
  2. Step 2: Convert to fraction form
    455,145.20/638,136.40 = 455,145.20/x
  3. Step 3: Cross multiply
    455,145.20x = 638,136.40 × 455,145.20
  4. Step 4: Simplify right side
    455,145.20x = 290,444,719,405.28
  5. Step 5: Solve for x
    x = 290,444,719,405.28/455,145.20
  6. Step 6: Final answer
    x = 638,136.40

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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.