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Finding the Fourth Proportional to 85,640.90, 118,176.43 and 51,178.79

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Solution

The fourth proportional to 85,640.90, 118,176.43 and 51,178.79 is: 70,621.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,640.90 : 118,176.43 = 51,178.79 : x
  2. Step 2: Convert to fraction form
    85,640.90/118,176.43 = 51,178.79/x
  3. Step 3: Cross multiply
    85,640.90x = 118,176.43 × 51,178.79
  4. Step 4: Simplify right side
    85,640.90x = 6,048,126,693.92
  5. Step 5: Solve for x
    x = 6,048,126,693.92/85,640.90
  6. Step 6: Final answer
    x = 70,621.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.