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Finding the Fourth Proportional to 85,701.40, 128,502.88 and 45,671.10

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Solution

The fourth proportional to 85,701.40, 128,502.88 and 45,671.10 is: 68,480.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,701.40 : 128,502.88 = 45,671.10 : x
  2. Step 2: Convert to fraction form
    85,701.40/128,502.88 = 45,671.10/x
  3. Step 3: Cross multiply
    85,701.40x = 128,502.88 × 45,671.10
  4. Step 4: Simplify right side
    85,701.40x = 5,868,867,776.57
  5. Step 5: Solve for x
    x = 5,868,867,776.57/85,701.40
  6. Step 6: Final answer
    x = 68,480.42

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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.