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Finding the Third Proportional to 128,520 and 278,490

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Solution

The third proportional to 128,520 and 278,490 is: 603,460.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520 : 278,490 = 278,490 : x
  2. Step 2: Convert to fraction form
    128,520/278,490 = 278,490/x
  3. Step 3: Cross multiply
    128,520x = 278,490 × 278,490
  4. Step 4: Simplify right side
    128,520x = 77,556,680,100
  5. Step 5: Solve for x
    x = 77,556,680,100/128,520
  6. Step 6: Final answer
    x = 603,460.01

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.