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Finding the Third Proportional to 458,428 and 688,508

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Solution

The third proportional to 458,428 and 688,508 is: 1,034,062.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,428 : 688,508 = 688,508 : x
  2. Step 2: Convert to fraction form
    458,428/688,508 = 688,508/x
  3. Step 3: Cross multiply
    458,428x = 688,508 × 688,508
  4. Step 4: Simplify right side
    458,428x = 474,043,266,064
  5. Step 5: Solve for x
    x = 474,043,266,064/458,428
  6. Step 6: Final answer
    x = 1,034,062.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.