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Finding the Fourth Proportional to 85,808.20, 128,712.30 and 72,718.60

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Solution

The fourth proportional to 85,808.20, 128,712.30 and 72,718.60 is: 109,077.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,808.20 : 128,712.30 = 72,718.60 : x
  2. Step 2: Convert to fraction form
    85,808.20/128,712.30 = 72,718.60/x
  3. Step 3: Cross multiply
    85,808.20x = 128,712.30 × 72,718.60
  4. Step 4: Simplify right side
    85,808.20x = 9,359,778,258.78
  5. Step 5: Solve for x
    x = 9,359,778,258.78/85,808.20
  6. Step 6: Final answer
    x = 109,077.90

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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.