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Finding the Fourth Proportional to 128,897.59, 193,268.71 and 57,807.36

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Solution

The fourth proportional to 128,897.59, 193,268.71 and 57,807.36 is: 86,676.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.59 : 193,268.71 = 57,807.36 : x
  2. Step 2: Convert to fraction form
    128,897.59/193,268.71 = 57,807.36/x
  3. Step 3: Cross multiply
    128,897.59x = 193,268.71 × 57,807.36
  4. Step 4: Simplify right side
    128,897.59x = 11,172,353,895.71
  5. Step 5: Solve for x
    x = 11,172,353,895.71/128,897.59
  6. Step 6: Final answer
    x = 86,676.20

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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.