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Finding the Fourth Proportional to 395,128.15, 545,276.88 and 213,841.40

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Solution

The fourth proportional to 395,128.15, 545,276.88 and 213,841.40 is: 295,101.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,128.15 : 545,276.88 = 213,841.40 : x
  2. Step 2: Convert to fraction form
    395,128.15/545,276.88 = 213,841.40/x
  3. Step 3: Cross multiply
    395,128.15x = 545,276.88 × 213,841.40
  4. Step 4: Simplify right side
    395,128.15x = 116,602,768,680.45
  5. Step 5: Solve for x
    x = 116,602,768,680.45/395,128.15
  6. Step 6: Final answer
    x = 295,101.14

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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.