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Finding the Fourth Proportional to 388,863, 536,630.94 and 210,015

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Solution

The fourth proportional to 388,863, 536,630.94 and 210,015 is: 289,820.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,863 : 536,630.94 = 210,015 : x
  2. Step 2: Convert to fraction form
    388,863/536,630.94 = 210,015/x
  3. Step 3: Cross multiply
    388,863x = 536,630.94 × 210,015
  4. Step 4: Simplify right side
    388,863x = 112,700,546,864.10
  5. Step 5: Solve for x
    x = 112,700,546,864.10/388,863
  6. Step 6: Final answer
    x = 289,820.70

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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.