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Finding the Fourth Proportional to 554,357.21, 765,009.23 and 312,641.87

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Solution

The fourth proportional to 554,357.21, 765,009.23 and 312,641.87 is: 431,443.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    554,357.21 : 765,009.23 = 312,641.87 : x
  2. Step 2: Convert to fraction form
    554,357.21/765,009.23 = 312,641.87/x
  3. Step 3: Cross multiply
    554,357.21x = 765,009.23 × 312,641.87
  4. Step 4: Simplify right side
    554,357.21x = 239,173,910,846.21
  5. Step 5: Solve for x
    x = 239,173,910,846.21/554,357.21
  6. Step 6: Final answer
    x = 431,443.68

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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.