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Finding the Fourth Proportional to 661,315.20, 991,972.80 and 395,894.40

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Solution

The fourth proportional to 661,315.20, 991,972.80 and 395,894.40 is: 593,841.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,315.20 : 991,972.80 = 395,894.40 : x
  2. Step 2: Convert to fraction form
    661,315.20/991,972.80 = 395,894.40/x
  3. Step 3: Cross multiply
    661,315.20x = 991,972.80 × 395,894.40
  4. Step 4: Simplify right side
    661,315.20x = 392,716,476,472.32
  5. Step 5: Solve for x
    x = 392,716,476,472.32/661,315.20
  6. Step 6: Final answer
    x = 593,841.60

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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.