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Finding the Fourth Proportional to 280,146.66, 386,634.78 and 155,980.14

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Solution

The fourth proportional to 280,146.66, 386,634.78 and 155,980.14 is: 215,270.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,146.66 : 386,634.78 = 155,980.14 : x
  2. Step 2: Convert to fraction form
    280,146.66/386,634.78 = 155,980.14/x
  3. Step 3: Cross multiply
    280,146.66x = 386,634.78 × 155,980.14
  4. Step 4: Simplify right side
    280,146.66x = 60,307,347,113.27
  5. Step 5: Solve for x
    x = 60,307,347,113.27/280,146.66
  6. Step 6: Final answer
    x = 215,270.63

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1.5x scale

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.