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Finding the Fourth Proportional to 390,942.99, 539,455.82 and 218,870.37

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Solution

The fourth proportional to 390,942.99, 539,455.82 and 218,870.37 is: 302,015.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,942.99 : 539,455.82 = 218,870.37 : x
  2. Step 2: Convert to fraction form
    390,942.99/539,455.82 = 218,870.37/x
  3. Step 3: Cross multiply
    390,942.99x = 539,455.82 × 218,870.37
  4. Step 4: Simplify right side
    390,942.99x = 118,070,893,827.70
  5. Step 5: Solve for x
    x = 118,070,893,827.70/390,942.99
  6. Step 6: Final answer
    x = 302,015.63

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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.