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Finding the Fourth Proportional to 390,684.75, 539,148.20 and 211,836.75

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Solution

The fourth proportional to 390,684.75, 539,148.20 and 211,836.75 is: 292,336.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,684.75 : 539,148.20 = 211,836.75 : x
  2. Step 2: Convert to fraction form
    390,684.75/539,148.20 = 211,836.75/x
  3. Step 3: Cross multiply
    390,684.75x = 539,148.20 × 211,836.75
  4. Step 4: Simplify right side
    390,684.75x = 114,211,401,397.17
  5. Step 5: Solve for x
    x = 114,211,401,397.17/390,684.75
  6. Step 6: Final answer
    x = 292,336.47

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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.