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Finding the Fourth Proportional to 643,425.84, 887,928.71 and 356,945.93

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Solution

The fourth proportional to 643,425.84, 887,928.71 and 356,945.93 is: 492,585.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,425.84 : 887,928.71 = 356,945.93 : x
  2. Step 2: Convert to fraction form
    643,425.84/887,928.71 = 356,945.93/x
  3. Step 3: Cross multiply
    643,425.84x = 887,928.71 × 356,945.93
  4. Step 4: Simplify right side
    643,425.84x = 316,942,536,270.01
  5. Step 5: Solve for x
    x = 316,942,536,270.01/643,425.84
  6. Step 6: Final answer
    x = 492,585.96

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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.