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Finding the Fourth Proportional to 221,012.55, 305,033.90 and 130,390.70

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Solution

The fourth proportional to 221,012.55, 305,033.90 and 130,390.70 is: 179,960.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,012.55 : 305,033.90 = 130,390.70 : x
  2. Step 2: Convert to fraction form
    221,012.55/305,033.90 = 130,390.70/x
  3. Step 3: Cross multiply
    221,012.55x = 305,033.90 × 130,390.70
  4. Step 4: Simplify right side
    221,012.55x = 39,773,581,567.61
  5. Step 5: Solve for x
    x = 39,773,581,567.61/221,012.55
  6. Step 6: Final answer
    x = 179,960.74

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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.