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Finding the Fourth Proportional to 678,963.40, 936,579.72 and 423,871.72

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Solution

The fourth proportional to 678,963.40, 936,579.72 and 423,871.72 is: 584,699.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,963.40 : 936,579.72 = 423,871.72 : x
  2. Step 2: Convert to fraction form
    678,963.40/936,579.72 = 423,871.72/x
  3. Step 3: Cross multiply
    678,963.40x = 936,579.72 × 423,871.72
  4. Step 4: Simplify right side
    678,963.40x = 396,989,656,833.52
  5. Step 5: Solve for x
    x = 396,989,656,833.52/678,963.40
  6. Step 6: Final answer
    x = 584,699.64

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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.