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Finding the Fourth Proportional to 85,459.68, 128,051.28 and 69,884.64

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Solution

The fourth proportional to 85,459.68, 128,051.28 and 69,884.64 is: 104,713.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,459.68 : 128,051.28 = 69,884.64 : x
  2. Step 2: Convert to fraction form
    85,459.68/128,051.28 = 69,884.64/x
  3. Step 3: Cross multiply
    85,459.68x = 128,051.28 × 69,884.64
  4. Step 4: Simplify right side
    85,459.68x = 8,948,817,604.34
  5. Step 5: Solve for x
    x = 8,948,817,604.34/85,459.68
  6. Step 6: Final answer
    x = 104,713.91

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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.