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Finding the Fourth Proportional to 85,412.68, 128,007.54 and 61,799.76

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Solution

The fourth proportional to 85,412.68, 128,007.54 and 61,799.76 is: 92,618.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,412.68 : 128,007.54 = 61,799.76 : x
  2. Step 2: Convert to fraction form
    85,412.68/128,007.54 = 61,799.76/x
  3. Step 3: Cross multiply
    85,412.68x = 128,007.54 × 61,799.76
  4. Step 4: Simplify right side
    85,412.68x = 7,910,835,250.19
  5. Step 5: Solve for x
    x = 7,910,835,250.19/85,412.68
  6. Step 6: Final answer
    x = 92,618.98

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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.