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Finding the Fourth Proportional to 390,719.55, 538,676.10 and 281,732.68

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Solution

The fourth proportional to 390,719.55, 538,676.10 and 281,732.68 is: 388,418.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,719.55 : 538,676.10 = 281,732.68 : x
  2. Step 2: Convert to fraction form
    390,719.55/538,676.10 = 281,732.68/x
  3. Step 3: Cross multiply
    390,719.55x = 538,676.10 × 281,732.68
  4. Step 4: Simplify right side
    390,719.55x = 151,762,661,185.92
  5. Step 5: Solve for x
    x = 151,762,661,185.92/390,719.55
  6. Step 6: Final answer
    x = 388,418.40

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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.