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Finding the Fourth Proportional to 85,606.95, 128,440.71 and 38,217.63

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Solution

The fourth proportional to 85,606.95, 128,440.71 and 38,217.63 is: 57,339.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,606.95 : 128,440.71 = 38,217.63 : x
  2. Step 2: Convert to fraction form
    85,606.95/128,440.71 = 38,217.63/x
  3. Step 3: Cross multiply
    85,606.95x = 128,440.71 × 38,217.63
  4. Step 4: Simplify right side
    85,606.95x = 4,908,699,531.72
  5. Step 5: Solve for x
    x = 4,908,699,531.72/85,606.95
  6. Step 6: Final answer
    x = 57,339.97

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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.