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Finding the Fourth Proportional to 155,783.76, 214,991.70 and 90,385.98

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Solution

The fourth proportional to 155,783.76, 214,991.70 and 90,385.98 is: 124,738.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,783.76 : 214,991.70 = 90,385.98 : x
  2. Step 2: Convert to fraction form
    155,783.76/214,991.70 = 90,385.98/x
  3. Step 3: Cross multiply
    155,783.76x = 214,991.70 × 90,385.98
  4. Step 4: Simplify right side
    155,783.76x = 19,432,235,496.37
  5. Step 5: Solve for x
    x = 19,432,235,496.37/155,783.76
  6. Step 6: Final answer
    x = 124,738.52

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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.