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Finding the Third Proportional to 249,486 and 390,920

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Solution

The third proportional to 249,486 and 390,920 is: 612,533.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    249,486 : 390,920 = 390,920 : x
  2. Step 2: Convert to fraction form
    249,486/390,920 = 390,920/x
  3. Step 3: Cross multiply
    249,486x = 390,920 × 390,920
  4. Step 4: Simplify right side
    249,486x = 152,818,446,400
  5. Step 5: Solve for x
    x = 152,818,446,400/249,486
  6. Step 6: Final answer
    x = 612,533.15

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.