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Finding the Fourth Proportional to 389,970.61, 538,170.47 and 220,230.25

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Solution

The fourth proportional to 389,970.61, 538,170.47 and 220,230.25 is: 303,923.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,970.61 : 538,170.47 = 220,230.25 : x
  2. Step 2: Convert to fraction form
    389,970.61/538,170.47 = 220,230.25/x
  3. Step 3: Cross multiply
    389,970.61x = 538,170.47 × 220,230.25
  4. Step 4: Simplify right side
    389,970.61x = 118,521,417,150.72
  5. Step 5: Solve for x
    x = 118,521,417,150.72/389,970.61
  6. Step 6: Final answer
    x = 303,923.97

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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.