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Finding the Third Proportional to 390,562 and 625,155

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Solution

The third proportional to 390,562 and 625,155 is: 1,000,657.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,562 : 625,155 = 625,155 : x
  2. Step 2: Convert to fraction form
    390,562/625,155 = 625,155/x
  3. Step 3: Cross multiply
    390,562x = 625,155 × 625,155
  4. Step 4: Simplify right side
    390,562x = 390,818,774,025
  5. Step 5: Solve for x
    x = 390,818,774,025/390,562
  6. Step 6: Final answer
    x = 1,000,657.45

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.