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Finding the Fourth Proportional to 711,474.98, 981,842.58 and 389,178

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Solution

The fourth proportional to 711,474.98, 981,842.58 and 389,178 is: 537,069.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,474.98 : 981,842.58 = 389,178 : x
  2. Step 2: Convert to fraction form
    711,474.98/981,842.58 = 389,178/x
  3. Step 3: Cross multiply
    711,474.98x = 981,842.58 × 389,178
  4. Step 4: Simplify right side
    711,474.98x = 382,111,531,599.24
  5. Step 5: Solve for x
    x = 382,111,531,599.24/711,474.98
  6. Step 6: Final answer
    x = 537,069.53

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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.