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Finding the Fourth Proportional to 390,910.74, 539,411.31 and 218,838.12

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Solution

The fourth proportional to 390,910.74, 539,411.31 and 218,838.12 is: 301,971.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,910.74 : 539,411.31 = 218,838.12 : x
  2. Step 2: Convert to fraction form
    390,910.74/539,411.31 = 218,838.12/x
  3. Step 3: Cross multiply
    390,910.74x = 539,411.31 × 218,838.12
  4. Step 4: Simplify right side
    390,910.74x = 118,043,756,987.14
  5. Step 5: Solve for x
    x = 118,043,756,987.14/390,910.74
  6. Step 6: Final answer
    x = 301,971.13

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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.