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Finding the Third Proportional to 145,290 and 316,308

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Solution

The third proportional to 145,290 and 316,308 is: 688,627.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,290 : 316,308 = 316,308 : x
  2. Step 2: Convert to fraction form
    145,290/316,308 = 316,308/x
  3. Step 3: Cross multiply
    145,290x = 316,308 × 316,308
  4. Step 4: Simplify right side
    145,290x = 100,050,750,864
  5. Step 5: Solve for x
    x = 100,050,750,864/145,290
  6. Step 6: Final answer
    x = 688,627.92

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.