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Finding the Fourth Proportional to 390,857.74, 539,338.36 and 218,785.34

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Solution

The fourth proportional to 390,857.74, 539,338.36 and 218,785.34 is: 301,898.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,857.74 : 539,338.36 = 218,785.34 : x
  2. Step 2: Convert to fraction form
    390,857.74/539,338.36 = 218,785.34/x
  3. Step 3: Cross multiply
    390,857.74x = 539,338.36 × 218,785.34
  4. Step 4: Simplify right side
    390,857.74x = 117,999,326,467.64
  5. Step 5: Solve for x
    x = 117,999,326,467.64/390,857.74
  6. Step 6: Final answer
    x = 301,898.40

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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.