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Finding the Fourth Proportional to 85,507.79, 127,635.51 and 75,407.70

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Solution

The fourth proportional to 85,507.79, 127,635.51 and 75,407.70 is: 112,559.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,507.79 : 127,635.51 = 75,407.70 : x
  2. Step 2: Convert to fraction form
    85,507.79/127,635.51 = 75,407.70/x
  3. Step 3: Cross multiply
    85,507.79x = 127,635.51 × 75,407.70
  4. Step 4: Simplify right side
    85,507.79x = 9,624,700,247.43
  5. Step 5: Solve for x
    x = 9,624,700,247.43/85,507.79
  6. Step 6: Final answer
    x = 112,559.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.