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Finding the Fourth Proportional to 310,216.80, 465,325.20 and 85,611.90

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Solution

The fourth proportional to 310,216.80, 465,325.20 and 85,611.90 is: 128,417.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,216.80 : 465,325.20 = 85,611.90 : x
  2. Step 2: Convert to fraction form
    310,216.80/465,325.20 = 85,611.90/x
  3. Step 3: Cross multiply
    310,216.80x = 465,325.20 × 85,611.90
  4. Step 4: Simplify right side
    310,216.80x = 39,837,374,489.88
  5. Step 5: Solve for x
    x = 39,837,374,489.88/310,216.80
  6. Step 6: Final answer
    x = 128,417.85

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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.