Home / 128,931.40-193,397.10-81,692.20

Finding the Fourth Proportional to 128,931.40, 193,397.10 and 81,692.20

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Solution

The fourth proportional to 128,931.40, 193,397.10 and 81,692.20 is: 122,538.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,931.40 : 193,397.10 = 81,692.20 : x
  2. Step 2: Convert to fraction form
    128,931.40/193,397.10 = 81,692.20/x
  3. Step 3: Cross multiply
    128,931.40x = 193,397.10 × 81,692.20
  4. Step 4: Simplify right side
    128,931.40x = 15,799,034,572.62
  5. Step 5: Solve for x
    x = 15,799,034,572.62/128,931.40
  6. Step 6: Final answer
    x = 122,538.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.