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Finding the Third Proportional to 245,640 and 390,603

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Solution

The third proportional to 245,640 and 390,603 is: 621,115.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,640 : 390,603 = 390,603 : x
  2. Step 2: Convert to fraction form
    245,640/390,603 = 390,603/x
  3. Step 3: Cross multiply
    245,640x = 390,603 × 390,603
  4. Step 4: Simplify right side
    245,640x = 152,570,703,609
  5. Step 5: Solve for x
    x = 152,570,703,609/245,640
  6. Step 6: Final answer
    x = 621,115.06

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.