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Finding the Fourth Proportional to 455,919.30, 639,686.70 and 455,919.30

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Solution

The fourth proportional to 455,919.30, 639,686.70 and 455,919.30 is: 639,686.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,919.30 : 639,686.70 = 455,919.30 : x
  2. Step 2: Convert to fraction form
    455,919.30/639,686.70 = 455,919.30/x
  3. Step 3: Cross multiply
    455,919.30x = 639,686.70 × 455,919.30
  4. Step 4: Simplify right side
    455,919.30x = 291,645,512,483.31
  5. Step 5: Solve for x
    x = 291,645,512,483.31/455,919.30
  6. Step 6: Final answer
    x = 639,686.70

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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.