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Finding the Fourth Proportional to 660,738.42, 991,073.61 and 387,336.40

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Solution

The fourth proportional to 660,738.42, 991,073.61 and 387,336.40 is: 580,984.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,738.42 : 991,073.61 = 387,336.40 : x
  2. Step 2: Convert to fraction form
    660,738.42/991,073.61 = 387,336.40/x
  3. Step 3: Cross multiply
    660,738.42x = 991,073.61 × 387,336.40
  4. Step 4: Simplify right side
    660,738.42x = 383,878,881,754.72
  5. Step 5: Solve for x
    x = 383,878,881,754.72/660,738.42
  6. Step 6: Final answer
    x = 580,984.65

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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.