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Finding the Third Proportional to 259,711.50 and 390,319.50

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Solution

The third proportional to 259,711.50 and 390,319.50 is: 586,609.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,711.50 : 390,319.50 = 390,319.50 : x
  2. Step 2: Convert to fraction form
    259,711.50/390,319.50 = 390,319.50/x
  3. Step 3: Cross multiply
    259,711.50x = 390,319.50 × 390,319.50
  4. Step 4: Simplify right side
    259,711.50x = 152,349,312,080.25
  5. Step 5: Solve for x
    x = 152,349,312,080.25/259,711.50
  6. Step 6: Final answer
    x = 586,609.80

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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.