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Finding the Fourth Proportional to 986,960.80, 1,479,404.40 and 387,690.40

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Solution

The fourth proportional to 986,960.80, 1,479,404.40 and 387,690.40 is: 581,128.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    986,960.80 : 1,479,404.40 = 387,690.40 : x
  2. Step 2: Convert to fraction form
    986,960.80/1,479,404.40 = 387,690.40/x
  3. Step 3: Cross multiply
    986,960.80x = 1,479,404.40 × 387,690.40
  4. Step 4: Simplify right side
    986,960.80x = 573,550,883,597.76
  5. Step 5: Solve for x
    x = 573,550,883,597.76/986,960.80
  6. Step 6: Final answer
    x = 581,128.33

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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.