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Finding the Fourth Proportional to 554,366.21, 765,021.65 and 312,650.87

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Solution

The fourth proportional to 554,366.21, 765,021.65 and 312,650.87 is: 431,456.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    554,366.21 : 765,021.65 = 312,650.87 : x
  2. Step 2: Convert to fraction form
    554,366.21/765,021.65 = 312,650.87/x
  3. Step 3: Cross multiply
    554,366.21x = 765,021.65 × 312,650.87
  4. Step 4: Simplify right side
    554,366.21x = 239,184,679,052.97
  5. Step 5: Solve for x
    x = 239,184,679,052.97/554,366.21
  6. Step 6: Final answer
    x = 431,456.10

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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.