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Finding the Fourth Proportional to 643,263.12, 887,703.68 and 356,783.21

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Solution

The fourth proportional to 643,263.12, 887,703.68 and 356,783.21 is: 492,361.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,263.12 : 887,703.68 = 356,783.21 : x
  2. Step 2: Convert to fraction form
    643,263.12/887,703.68 = 356,783.21/x
  3. Step 3: Cross multiply
    643,263.12x = 887,703.68 × 356,783.21
  4. Step 4: Simplify right side
    643,263.12x = 316,717,767,859.12
  5. Step 5: Solve for x
    x = 316,717,767,859.12/643,263.12
  6. Step 6: Final answer
    x = 492,361.15

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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.