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Finding the Fourth Proportional to 487,447.44, 672,450.78 and 315,421.00

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Solution

The fourth proportional to 487,447.44, 672,450.78 and 315,421.00 is: 435,134.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,447.44 : 672,450.78 = 315,421.00 : x
  2. Step 2: Convert to fraction form
    487,447.44/672,450.78 = 315,421.00/x
  3. Step 3: Cross multiply
    487,447.44x = 672,450.78 × 315,421.00
  4. Step 4: Simplify right side
    487,447.44x = 212,105,100,762.62
  5. Step 5: Solve for x
    x = 212,105,100,762.62/487,447.44
  6. Step 6: Final answer
    x = 435,134.30

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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.