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Finding the Fourth Proportional to 385,405.40, 577,373.70 and 207,853.40

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Solution

The fourth proportional to 385,405.40, 577,373.70 and 207,853.40 is: 311,384.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,405.40 : 577,373.70 = 207,853.40 : x
  2. Step 2: Convert to fraction form
    385,405.40/577,373.70 = 207,853.40/x
  3. Step 3: Cross multiply
    385,405.40x = 577,373.70 × 207,853.40
  4. Step 4: Simplify right side
    385,405.40x = 120,009,086,615.58
  5. Step 5: Solve for x
    x = 120,009,086,615.58/385,405.40
  6. Step 6: Final answer
    x = 311,384.03

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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.