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Finding the Fourth Proportional to 455,920.30, 639,688.10 and 455,920.30

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Solution

The fourth proportional to 455,920.30, 639,688.10 and 455,920.30 is: 639,688.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,920.30 : 639,688.10 = 455,920.30 : x
  2. Step 2: Convert to fraction form
    455,920.30/639,688.10 = 455,920.30/x
  3. Step 3: Cross multiply
    455,920.30x = 639,688.10 × 455,920.30
  4. Step 4: Simplify right side
    455,920.30x = 291,646,790,458.43
  5. Step 5: Solve for x
    x = 291,646,790,458.43/455,920.30
  6. Step 6: Final answer
    x = 639,688.10

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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.