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Finding the Third Proportional to 245,620 and 390,574

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Solution

The third proportional to 245,620 and 390,574 is: 621,073.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,620 : 390,574 = 390,574 : x
  2. Step 2: Convert to fraction form
    245,620/390,574 = 390,574/x
  3. Step 3: Cross multiply
    245,620x = 390,574 × 390,574
  4. Step 4: Simplify right side
    245,620x = 152,548,049,476
  5. Step 5: Solve for x
    x = 152,548,049,476/245,620
  6. Step 6: Final answer
    x = 621,073.40

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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.