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Finding the Fourth Proportional to 455,139.70, 638,128.70 and 455,139.70

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Solution

The fourth proportional to 455,139.70, 638,128.70 and 455,139.70 is: 638,128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,139.70 : 638,128.70 = 455,139.70 : x
  2. Step 2: Convert to fraction form
    455,139.70/638,128.70 = 455,139.70/x
  3. Step 3: Cross multiply
    455,139.70x = 638,128.70 × 455,139.70
  4. Step 4: Simplify right side
    455,139.70x = 290,437,705,079.39
  5. Step 5: Solve for x
    x = 290,437,705,079.39/455,139.70
  6. Step 6: Final answer
    x = 638,128.70

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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.