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Finding the Third Proportional to 286,368 and 420,785

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Solution

The third proportional to 286,368 and 420,785 is: 618,295.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,368 : 420,785 = 420,785 : x
  2. Step 2: Convert to fraction form
    286,368/420,785 = 420,785/x
  3. Step 3: Cross multiply
    286,368x = 420,785 × 420,785
  4. Step 4: Simplify right side
    286,368x = 177,060,016,225
  5. Step 5: Solve for x
    x = 177,060,016,225/286,368
  6. Step 6: Final answer
    x = 618,295.40

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.