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Finding the Fourth Proportional to 318,992.70, 478,051.65 and 259,943.70

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Solution

The fourth proportional to 318,992.70, 478,051.65 and 259,943.70 is: 389,559.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,992.70 : 478,051.65 = 259,943.70 : x
  2. Step 2: Convert to fraction form
    318,992.70/478,051.65 = 259,943.70/x
  3. Step 3: Cross multiply
    318,992.70x = 478,051.65 × 259,943.70
  4. Step 4: Simplify right side
    318,992.70x = 124,266,514,692.11
  5. Step 5: Solve for x
    x = 124,266,514,692.11/318,992.70
  6. Step 6: Final answer
    x = 389,559.12

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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.