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Finding the Fourth Proportional to 85,392.86, 128,048.28 and 40,376.70

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Solution

The fourth proportional to 85,392.86, 128,048.28 and 40,376.70 is: 60,545.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,392.86 : 128,048.28 = 40,376.70 : x
  2. Step 2: Convert to fraction form
    85,392.86/128,048.28 = 40,376.70/x
  3. Step 3: Cross multiply
    85,392.86x = 128,048.28 × 40,376.70
  4. Step 4: Simplify right side
    85,392.86x = 5,170,166,987.08
  5. Step 5: Solve for x
    x = 5,170,166,987.08/85,392.86
  6. Step 6: Final answer
    x = 60,545.66

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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.