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Finding the Fourth Proportional to 390,575.58, 539,021.43 and 218,550.21

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Solution

The fourth proportional to 390,575.58, 539,021.43 and 218,550.21 is: 301,614.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,575.58 : 539,021.43 = 218,550.21 : x
  2. Step 2: Convert to fraction form
    390,575.58/539,021.43 = 218,550.21/x
  3. Step 3: Cross multiply
    390,575.58x = 539,021.43 × 218,550.21
  4. Step 4: Simplify right side
    390,575.58x = 117,803,246,721.00
  5. Step 5: Solve for x
    x = 117,803,246,721.00/390,575.58
  6. Step 6: Final answer
    x = 301,614.47

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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.