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Finding the Fourth Proportional to 405,987.20, 569,315.20 and 405,987.20

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Solution

The fourth proportional to 405,987.20, 569,315.20 and 405,987.20 is: 569,315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,987.20 : 569,315.20 = 405,987.20 : x
  2. Step 2: Convert to fraction form
    405,987.20/569,315.20 = 405,987.20/x
  3. Step 3: Cross multiply
    405,987.20x = 569,315.20 × 405,987.20
  4. Step 4: Simplify right side
    405,987.20x = 231,134,683,965.44
  5. Step 5: Solve for x
    x = 231,134,683,965.44/405,987.20
  6. Step 6: Final answer
    x = 569,315.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.