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Finding the Fourth Proportional to 678,402.61, 936,633.72 and 420,555.11

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Solution

The fourth proportional to 678,402.61, 936,633.72 and 420,555.11 is: 580,637.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,402.61 : 936,633.72 = 420,555.11 : x
  2. Step 2: Convert to fraction form
    678,402.61/936,633.72 = 420,555.11/x
  3. Step 3: Cross multiply
    678,402.61x = 936,633.72 × 420,555.11
  4. Step 4: Simplify right side
    678,402.61x = 393,906,094,038.22
  5. Step 5: Solve for x
    x = 393,906,094,038.22/678,402.61
  6. Step 6: Final answer
    x = 580,637.65

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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.