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Finding the Fourth Proportional to 128,918.40, 193,426.20 and 62,417.40

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Solution

The fourth proportional to 128,918.40, 193,426.20 and 62,417.40 is: 93,649.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,918.40 : 193,426.20 = 62,417.40 : x
  2. Step 2: Convert to fraction form
    128,918.40/193,426.20 = 62,417.40/x
  3. Step 3: Cross multiply
    128,918.40x = 193,426.20 × 62,417.40
  4. Step 4: Simplify right side
    128,918.40x = 12,073,160,495.88
  5. Step 5: Solve for x
    x = 12,073,160,495.88/128,918.40
  6. Step 6: Final answer
    x = 93,649.63

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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.