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Finding the Fourth Proportional to 85,476.70, 128,215.05 and 61,857.10

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Solution

The fourth proportional to 85,476.70, 128,215.05 and 61,857.10 is: 92,785.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,476.70 : 128,215.05 = 61,857.10 : x
  2. Step 2: Convert to fraction form
    85,476.70/128,215.05 = 61,857.10/x
  3. Step 3: Cross multiply
    85,476.70x = 128,215.05 × 61,857.10
  4. Step 4: Simplify right side
    85,476.70x = 7,931,011,169.36
  5. Step 5: Solve for x
    x = 7,931,011,169.36/85,476.70
  6. Step 6: Final answer
    x = 92,785.65

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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.