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Finding the Fourth Proportional to 85,813.40, 128,720.10 and 54,320.60

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Solution

The fourth proportional to 85,813.40, 128,720.10 and 54,320.60 is: 81,480.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,813.40 : 128,720.10 = 54,320.60 : x
  2. Step 2: Convert to fraction form
    85,813.40/128,720.10 = 54,320.60/x
  3. Step 3: Cross multiply
    85,813.40x = 128,720.10 × 54,320.60
  4. Step 4: Simplify right side
    85,813.40x = 6,992,153,064.06
  5. Step 5: Solve for x
    x = 6,992,153,064.06/85,813.40
  6. Step 6: Final answer
    x = 81,480.90

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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.