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Finding the Fourth Proportional to 55,011.48, 75,918.78 and 31,143.48

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Solution

The fourth proportional to 55,011.48, 75,918.78 and 31,143.48 is: 42,979.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,011.48 : 75,918.78 = 31,143.48 : x
  2. Step 2: Convert to fraction form
    55,011.48/75,918.78 = 31,143.48/x
  3. Step 3: Cross multiply
    55,011.48x = 75,918.78 × 31,143.48
  4. Step 4: Simplify right side
    55,011.48x = 2,364,375,006.55
  5. Step 5: Solve for x
    x = 2,364,375,006.55/55,011.48
  6. Step 6: Final answer
    x = 42,979.67

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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.