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Finding the Fourth Proportional to 1,390,021, 1,918,216.02 and 786,409

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Solution

The fourth proportional to 1,390,021, 1,918,216.02 and 786,409 is: 1,085,237.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,021 : 1,918,216.02 = 786,409 : x
  2. Step 2: Convert to fraction form
    1,390,021/1,918,216.02 = 786,409/x
  3. Step 3: Cross multiply
    1,390,021x = 1,918,216.02 × 786,409
  4. Step 4: Simplify right side
    1,390,021x = 1,508,502,342,072.18
  5. Step 5: Solve for x
    x = 1,508,502,342,072.18/1,390,021
  6. Step 6: Final answer
    x = 1,085,237.09

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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.