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Finding the Fourth Proportional to 518,440.34, 715,648.30 and 405,299.54

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Solution

The fourth proportional to 518,440.34, 715,648.30 and 405,299.54 is: 559,470.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,440.34 : 715,648.30 = 405,299.54 : x
  2. Step 2: Convert to fraction form
    518,440.34/715,648.30 = 405,299.54/x
  3. Step 3: Cross multiply
    518,440.34x = 715,648.30 × 405,299.54
  4. Step 4: Simplify right side
    518,440.34x = 290,051,926,791.78
  5. Step 5: Solve for x
    x = 290,051,926,791.78/518,440.34
  6. Step 6: Final answer
    x = 559,470.21

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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.