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Finding the Fourth Proportional to 85,486.88, 128,056.16 and 69,748

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Solution

The fourth proportional to 85,486.88, 128,056.16 and 69,748 is: 104,479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,486.88 : 128,056.16 = 69,748 : x
  2. Step 2: Convert to fraction form
    85,486.88/128,056.16 = 69,748/x
  3. Step 3: Cross multiply
    85,486.88x = 128,056.16 × 69,748
  4. Step 4: Simplify right side
    85,486.88x = 8,931,661,047.68
  5. Step 5: Solve for x
    x = 8,931,661,047.68/85,486.88
  6. Step 6: Final answer
    x = 104,479.90

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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.