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Finding the Fourth Proportional to 690,681, 1,036,169.70 and 391,305

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Solution

The fourth proportional to 690,681, 1,036,169.70 and 391,305 is: 587,041.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    690,681 : 1,036,169.70 = 391,305 : x
  2. Step 2: Convert to fraction form
    690,681/1,036,169.70 = 391,305/x
  3. Step 3: Cross multiply
    690,681x = 1,036,169.70 × 391,305
  4. Step 4: Simplify right side
    690,681x = 405,458,384,458.50
  5. Step 5: Solve for x
    x = 405,458,384,458.50/690,681
  6. Step 6: Final answer
    x = 587,041.46

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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.