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Finding the Fourth Proportional to 78,668.55, 108,562.28 and 42,858.45

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Solution

The fourth proportional to 78,668.55, 108,562.28 and 42,858.45 is: 59,144.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,668.55 : 108,562.28 = 42,858.45 : x
  2. Step 2: Convert to fraction form
    78,668.55/108,562.28 = 42,858.45/x
  3. Step 3: Cross multiply
    78,668.55x = 108,562.28 × 42,858.45
  4. Step 4: Simplify right side
    78,668.55x = 4,652,810,834.97
  5. Step 5: Solve for x
    x = 4,652,810,834.97/78,668.55
  6. Step 6: Final answer
    x = 59,144.48

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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.