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Finding the Fourth Proportional to 660,691.18, 911,738.53 and 385,031.46

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Solution

The fourth proportional to 660,691.18, 911,738.53 and 385,031.46 is: 531,334.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,691.18 : 911,738.53 = 385,031.46 : x
  2. Step 2: Convert to fraction form
    660,691.18/911,738.53 = 385,031.46/x
  3. Step 3: Cross multiply
    660,691.18x = 911,738.53 × 385,031.46
  4. Step 4: Simplify right side
    660,691.18x = 351,048,017,344.15
  5. Step 5: Solve for x
    x = 351,048,017,344.15/660,691.18
  6. Step 6: Final answer
    x = 531,334.50

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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.