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Finding the Third Proportional to 315,588 and 689,640

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Solution

The third proportional to 315,588 and 689,640 is: 1,507,038.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,588 : 689,640 = 689,640 : x
  2. Step 2: Convert to fraction form
    315,588/689,640 = 689,640/x
  3. Step 3: Cross multiply
    315,588x = 689,640 × 689,640
  4. Step 4: Simplify right side
    315,588x = 475,603,329,600
  5. Step 5: Solve for x
    x = 475,603,329,600/315,588
  6. Step 6: Final answer
    x = 1,507,038.70

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.