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Finding the Fourth Proportional to 85,980.11, 128,271.98 and 81,329.87

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Solution

The fourth proportional to 85,980.11, 128,271.98 and 81,329.87 is: 121,334.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,980.11 : 128,271.98 = 81,329.87 : x
  2. Step 2: Convert to fraction form
    85,980.11/128,271.98 = 81,329.87/x
  3. Step 3: Cross multiply
    85,980.11x = 128,271.98 × 81,329.87
  4. Step 4: Simplify right side
    85,980.11x = 10,432,343,458.04
  5. Step 5: Solve for x
    x = 10,432,343,458.04/85,980.11
  6. Step 6: Final answer
    x = 121,334.38

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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.