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Finding the Third Proportional to 438,421 and 660,528

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Solution

The third proportional to 438,421 and 660,528 is: 995,155.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,421 : 660,528 = 660,528 : x
  2. Step 2: Convert to fraction form
    438,421/660,528 = 660,528/x
  3. Step 3: Cross multiply
    438,421x = 660,528 × 660,528
  4. Step 4: Simplify right side
    438,421x = 436,297,238,784
  5. Step 5: Solve for x
    x = 436,297,238,784/438,421
  6. Step 6: Final answer
    x = 995,155.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.