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Finding the Fourth Proportional to 85,555.94, 128,358.50 and 43,434.32

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Solution

The fourth proportional to 85,555.94, 128,358.50 and 43,434.32 is: 65,163.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,555.94 : 128,358.50 = 43,434.32 : x
  2. Step 2: Convert to fraction form
    85,555.94/128,358.50 = 43,434.32/x
  3. Step 3: Cross multiply
    85,555.94x = 128,358.50 × 43,434.32
  4. Step 4: Simplify right side
    85,555.94x = 5,575,163,304.76
  5. Step 5: Solve for x
    x = 5,575,163,304.76/85,555.94
  6. Step 6: Final answer
    x = 65,163.96

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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.