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Finding the Fourth Proportional to 638,168.40, 880,678.40 and 351,698.96

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Solution

The fourth proportional to 638,168.40, 880,678.40 and 351,698.96 is: 485,347.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,168.40 : 880,678.40 = 351,698.96 : x
  2. Step 2: Convert to fraction form
    638,168.40/880,678.40 = 351,698.96/x
  3. Step 3: Cross multiply
    638,168.40x = 880,678.40 × 351,698.96
  4. Step 4: Simplify right side
    638,168.40x = 309,733,677,374.46
  5. Step 5: Solve for x
    x = 309,733,677,374.46/638,168.40
  6. Step 6: Final answer
    x = 485,347.88

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1.5x scale

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.