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Finding the Fourth Proportional to 879,139, 1,213,211.82 and 476,731

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Solution

The fourth proportional to 879,139, 1,213,211.82 and 476,731 is: 657,888.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,139 : 1,213,211.82 = 476,731 : x
  2. Step 2: Convert to fraction form
    879,139/1,213,211.82 = 476,731/x
  3. Step 3: Cross multiply
    879,139x = 1,213,211.82 × 476,731
  4. Step 4: Simplify right side
    879,139x = 578,375,684,160.42
  5. Step 5: Solve for x
    x = 578,375,684,160.42/879,139
  6. Step 6: Final answer
    x = 657,888.78

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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.