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Finding the Fourth Proportional to 128,718.63, 193,023.23 and 58,642.47

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Solution

The fourth proportional to 128,718.63, 193,023.23 and 58,642.47 is: 87,938.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,718.63 : 193,023.23 = 58,642.47 : x
  2. Step 2: Convert to fraction form
    128,718.63/193,023.23 = 58,642.47/x
  3. Step 3: Cross multiply
    128,718.63x = 193,023.23 × 58,642.47
  4. Step 4: Simplify right side
    128,718.63x = 11,319,358,681.37
  5. Step 5: Solve for x
    x = 11,319,358,681.37/128,718.63
  6. Step 6: Final answer
    x = 87,938.78

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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.