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Finding the Fourth Proportional to 561,720.69, 775,176.89 and 320,013.45

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Solution

The fourth proportional to 561,720.69, 775,176.89 and 320,013.45 is: 441,619.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,720.69 : 775,176.89 = 320,013.45 : x
  2. Step 2: Convert to fraction form
    561,720.69/775,176.89 = 320,013.45/x
  3. Step 3: Cross multiply
    561,720.69x = 775,176.89 × 320,013.45
  4. Step 4: Simplify right side
    561,720.69x = 248,067,029,329.10
  5. Step 5: Solve for x
    x = 248,067,029,329.10/561,720.69
  6. Step 6: Final answer
    x = 441,619.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.