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Finding the Third Proportional to 1,387 and 1,618

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Solution

The third proportional to 1,387 and 1,618 is: 1,887.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 1,618 = 1,618 : x
  2. Step 2: Convert to fraction form
    1,387/1,618 = 1,618/x
  3. Step 3: Cross multiply
    1,387x = 1,618 × 1,618
  4. Step 4: Simplify right side
    1,387x = 2,617,924
  5. Step 5: Solve for x
    x = 2,617,924/1,387
  6. Step 6: Final answer
    x = 1,887.47

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.