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Finding the Fourth Proportional to 85,866.60, 128,799.90 and 65,130.60

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Solution

The fourth proportional to 85,866.60, 128,799.90 and 65,130.60 is: 97,695.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,866.60 : 128,799.90 = 65,130.60 : x
  2. Step 2: Convert to fraction form
    85,866.60/128,799.90 = 65,130.60/x
  3. Step 3: Cross multiply
    85,866.60x = 128,799.90 × 65,130.60
  4. Step 4: Simplify right side
    85,866.60x = 8,388,814,766.94
  5. Step 5: Solve for x
    x = 8,388,814,766.94/85,866.60
  6. Step 6: Final answer
    x = 97,695.90

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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.