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Finding the Fourth Proportional to 711,698.40, 982,134.72 and 389,404.80

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Solution

The fourth proportional to 711,698.40, 982,134.72 and 389,404.80 is: 537,373.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,698.40 : 982,134.72 = 389,404.80 : x
  2. Step 2: Convert to fraction form
    711,698.40/982,134.72 = 389,404.80/x
  3. Step 3: Cross multiply
    711,698.40x = 982,134.72 × 389,404.80
  4. Step 4: Simplify right side
    711,698.40x = 382,447,974,214.66
  5. Step 5: Solve for x
    x = 382,447,974,214.66/711,698.40
  6. Step 6: Final answer
    x = 537,373.66

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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.