Home / 389,920.17-538,079.32-213,103.60

Finding the Fourth Proportional to 389,920.17, 538,079.32 and 213,103.60

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Solution

The fourth proportional to 389,920.17, 538,079.32 and 213,103.60 is: 294,077.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,920.17 : 538,079.32 = 213,103.60 : x
  2. Step 2: Convert to fraction form
    389,920.17/538,079.32 = 213,103.60/x
  3. Step 3: Cross multiply
    389,920.17x = 538,079.32 × 213,103.60
  4. Step 4: Simplify right side
    389,920.17x = 114,666,640,177.55
  5. Step 5: Solve for x
    x = 114,666,640,177.55/389,920.17
  6. Step 6: Final answer
    x = 294,077.22

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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.