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Finding the Fourth Proportional to 385,406.07, 531,506.98 and 330,939.72

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Solution

The fourth proportional to 385,406.07, 531,506.98 and 330,939.72 is: 456,393.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,406.07 : 531,506.98 = 330,939.72 : x
  2. Step 2: Convert to fraction form
    385,406.07/531,506.98 = 330,939.72/x
  3. Step 3: Cross multiply
    385,406.07x = 531,506.98 × 330,939.72
  4. Step 4: Simplify right side
    385,406.07x = 175,896,770,719.11
  5. Step 5: Solve for x
    x = 175,896,770,719.11/385,406.07
  6. Step 6: Final answer
    x = 456,393.35

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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.