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Finding the Fourth Proportional to 85,664.40, 128,430.72 and 43,509.84

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Solution

The fourth proportional to 85,664.40, 128,430.72 and 43,509.84 is: 65,231.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,664.40 : 128,430.72 = 43,509.84 : x
  2. Step 2: Convert to fraction form
    85,664.40/128,430.72 = 43,509.84/x
  3. Step 3: Cross multiply
    85,664.40x = 128,430.72 × 43,509.84
  4. Step 4: Simplify right side
    85,664.40x = 5,588,000,078.28
  5. Step 5: Solve for x
    x = 5,588,000,078.28/85,664.40
  6. Step 6: Final answer
    x = 65,231.30

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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.