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Finding the Third Proportional to 292,390 and 640,618

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Solution

The third proportional to 292,390 and 640,618 is: 1,403,575.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    292,390 : 640,618 = 640,618 : x
  2. Step 2: Convert to fraction form
    292,390/640,618 = 640,618/x
  3. Step 3: Cross multiply
    292,390x = 640,618 × 640,618
  4. Step 4: Simplify right side
    292,390x = 410,391,421,924
  5. Step 5: Solve for x
    x = 410,391,421,924/292,390
  6. Step 6: Final answer
    x = 1,403,575.44

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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.