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Finding the Fourth Proportional to 111,681.32, 153,960.90 and 79,838.60

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Solution

The fourth proportional to 111,681.32, 153,960.90 and 79,838.60 is: 110,063.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,681.32 : 153,960.90 = 79,838.60 : x
  2. Step 2: Convert to fraction form
    111,681.32/153,960.90 = 79,838.60/x
  3. Step 3: Cross multiply
    111,681.32x = 153,960.90 × 79,838.60
  4. Step 4: Simplify right side
    111,681.32x = 12,292,022,710.74
  5. Step 5: Solve for x
    x = 12,292,022,710.74/111,681.32
  6. Step 6: Final answer
    x = 110,063.37

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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.