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Finding the Fourth Proportional to 386,307.63, 579,620.88 and 208,605.38

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Solution

The fourth proportional to 386,307.63, 579,620.88 and 208,605.38 is: 312,994.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,307.63 : 579,620.88 = 208,605.38 : x
  2. Step 2: Convert to fraction form
    386,307.63/579,620.88 = 208,605.38/x
  3. Step 3: Cross multiply
    386,307.63x = 579,620.88 × 208,605.38
  4. Step 4: Simplify right side
    386,307.63x = 120,912,031,030.23
  5. Step 5: Solve for x
    x = 120,912,031,030.23/386,307.63
  6. Step 6: Final answer
    x = 312,994.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.