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Finding the Fourth Proportional to 1,238,795.78, 1,856,938.71 and 839,476.94

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Solution

The fourth proportional to 1,238,795.78, 1,856,938.71 and 839,476.94 is: 1,258,364.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238,795.78 : 1,856,938.71 = 839,476.94 : x
  2. Step 2: Convert to fraction form
    1,238,795.78/1,856,938.71 = 839,476.94/x
  3. Step 3: Cross multiply
    1,238,795.78x = 1,856,938.71 × 839,476.94
  4. Step 4: Simplify right side
    1,238,795.78x = 1,558,857,226,038.35
  5. Step 5: Solve for x
    x = 1,558,857,226,038.35/1,238,795.78
  6. Step 6: Final answer
    x = 1,258,364.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.