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Finding the Fourth Proportional to 85,602.72, 128,221.20 and 69,519.77

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Solution

The fourth proportional to 85,602.72, 128,221.20 and 69,519.77 is: 104,131.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,602.72 : 128,221.20 = 69,519.77 : x
  2. Step 2: Convert to fraction form
    85,602.72/128,221.20 = 69,519.77/x
  3. Step 3: Cross multiply
    85,602.72x = 128,221.20 × 69,519.77
  4. Step 4: Simplify right side
    85,602.72x = 8,913,908,333.12
  5. Step 5: Solve for x
    x = 8,913,908,333.12/85,602.72
  6. Step 6: Final answer
    x = 104,131.13

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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.