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Finding the Fourth Proportional to 628,658.63, 867,715.77 and 387,143.70

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Solution

The fourth proportional to 628,658.63, 867,715.77 and 387,143.70 is: 534,361.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,658.63 : 867,715.77 = 387,143.70 : x
  2. Step 2: Convert to fraction form
    628,658.63/867,715.77 = 387,143.70/x
  3. Step 3: Cross multiply
    628,658.63x = 867,715.77 × 387,143.70
  4. Step 4: Simplify right side
    628,658.63x = 335,930,693,746.15
  5. Step 5: Solve for x
    x = 335,930,693,746.15/628,658.63
  6. Step 6: Final answer
    x = 534,361.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.