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Finding the Fourth Proportional to 120,656.49, 166,510.40 and 72,900.61

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Solution

The fourth proportional to 120,656.49, 166,510.40 and 72,900.61 is: 100,605.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,656.49 : 166,510.40 = 72,900.61 : x
  2. Step 2: Convert to fraction form
    120,656.49/166,510.40 = 72,900.61/x
  3. Step 3: Cross multiply
    120,656.49x = 166,510.40 × 72,900.61
  4. Step 4: Simplify right side
    120,656.49x = 12,138,709,731.34
  5. Step 5: Solve for x
    x = 12,138,709,731.34/120,656.49
  6. Step 6: Final answer
    x = 100,605.53

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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.