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Finding the Fourth Proportional to 155,890.69, 215,127.78 and 84,270.07

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Solution

The fourth proportional to 155,890.69, 215,127.78 and 84,270.07 is: 116,291.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,890.69 : 215,127.78 = 84,270.07 : x
  2. Step 2: Convert to fraction form
    155,890.69/215,127.78 = 84,270.07/x
  3. Step 3: Cross multiply
    155,890.69x = 215,127.78 × 84,270.07
  4. Step 4: Simplify right side
    155,890.69x = 18,128,833,079.54
  5. Step 5: Solve for x
    x = 18,128,833,079.54/155,890.69
  6. Step 6: Final answer
    x = 116,291.95

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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.