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Finding the Fourth Proportional to 120,790.72, 166,692.36 and 70,480

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Solution

The fourth proportional to 120,790.72, 166,692.36 and 70,480 is: 97,263.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,790.72 : 166,692.36 = 70,480 : x
  2. Step 2: Convert to fraction form
    120,790.72/166,692.36 = 70,480/x
  3. Step 3: Cross multiply
    120,790.72x = 166,692.36 × 70,480
  4. Step 4: Simplify right side
    120,790.72x = 11,748,477,532.80
  5. Step 5: Solve for x
    x = 11,748,477,532.80/120,790.72
  6. Step 6: Final answer
    x = 97,263.08

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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.