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Finding the Fourth Proportional to 668,631.49, 922,711.38 and 378,236.86

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Solution

The fourth proportional to 668,631.49, 922,711.38 and 378,236.86 is: 521,966.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,631.49 : 922,711.38 = 378,236.86 : x
  2. Step 2: Convert to fraction form
    668,631.49/922,711.38 = 378,236.86/x
  3. Step 3: Cross multiply
    668,631.49x = 922,711.38 × 378,236.86
  4. Step 4: Simplify right side
    668,631.49x = 349,003,455,057.47
  5. Step 5: Solve for x
    x = 349,003,455,057.47/668,631.49
  6. Step 6: Final answer
    x = 521,966.82

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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.