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Finding the Fourth Proportional to 111,139.30, 153,369.21 and 63,391.63

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Solution

The fourth proportional to 111,139.30, 153,369.21 and 63,391.63 is: 87,478.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,139.30 : 153,369.21 = 63,391.63 : x
  2. Step 2: Convert to fraction form
    111,139.30/153,369.21 = 63,391.63/x
  3. Step 3: Cross multiply
    111,139.30x = 153,369.21 × 63,391.63
  4. Step 4: Simplify right side
    111,139.30x = 9,722,324,213.71
  5. Step 5: Solve for x
    x = 9,722,324,213.71/111,139.30
  6. Step 6: Final answer
    x = 87,478.72

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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.