Home / 390,138.10-538,423.73-220,403.38

Finding the Fourth Proportional to 390,138.10, 538,423.73 and 220,403.38

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Solution

The fourth proportional to 390,138.10, 538,423.73 and 220,403.38 is: 304,175.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,138.10 : 538,423.73 = 220,403.38 : x
  2. Step 2: Convert to fraction form
    390,138.10/538,423.73 = 220,403.38/x
  3. Step 3: Cross multiply
    390,138.10x = 538,423.73 × 220,403.38
  4. Step 4: Simplify right side
    390,138.10x = 118,670,409,964.21
  5. Step 5: Solve for x
    x = 118,670,409,964.21/390,138.10
  6. Step 6: Final answer
    x = 304,175.39

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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.