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Finding the Fourth Proportional to 390,634.41, 586,007.75 and 120,783.57

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Solution

The fourth proportional to 390,634.41, 586,007.75 and 120,783.57 is: 181,192.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,634.41 : 586,007.75 = 120,783.57 : x
  2. Step 2: Convert to fraction form
    390,634.41/586,007.75 = 120,783.57/x
  3. Step 3: Cross multiply
    390,634.41x = 586,007.75 × 120,783.57
  4. Step 4: Simplify right side
    390,634.41x = 70,780,108,813.98
  5. Step 5: Solve for x
    x = 70,780,108,813.98/390,634.41
  6. Step 6: Final answer
    x = 181,192.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.