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Finding the Fourth Proportional to 390,007.59, 538,203.90 and 217,928.34

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Solution

The fourth proportional to 390,007.59, 538,203.90 and 217,928.34 is: 300,737.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,007.59 : 538,203.90 = 217,928.34 : x
  2. Step 2: Convert to fraction form
    390,007.59/538,203.90 = 217,928.34/x
  3. Step 3: Cross multiply
    390,007.59x = 538,203.90 × 217,928.34
  4. Step 4: Simplify right side
    390,007.59x = 117,289,882,508.53
  5. Step 5: Solve for x
    x = 117,289,882,508.53/390,007.59
  6. Step 6: Final answer
    x = 300,737.44

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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.