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Finding the Fourth Proportional to 85,501.79, 128,140.86 and 45,973.79

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Solution

The fourth proportional to 85,501.79, 128,140.86 and 45,973.79 is: 68,900.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,501.79 : 128,140.86 = 45,973.79 : x
  2. Step 2: Convert to fraction form
    85,501.79/128,140.86 = 45,973.79/x
  3. Step 3: Cross multiply
    85,501.79x = 128,140.86 × 45,973.79
  4. Step 4: Simplify right side
    85,501.79x = 5,891,120,988.06
  5. Step 5: Solve for x
    x = 5,891,120,988.06/85,501.79
  6. Step 6: Final answer
    x = 68,900.56

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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.