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Finding the Fourth Proportional to 128,456.48, 192,211.68 and 77,674.40

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Solution

The fourth proportional to 128,456.48, 192,211.68 and 77,674.40 is: 116,225.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,456.48 : 192,211.68 = 77,674.40 : x
  2. Step 2: Convert to fraction form
    128,456.48/192,211.68 = 77,674.40/x
  3. Step 3: Cross multiply
    128,456.48x = 192,211.68 × 77,674.40
  4. Step 4: Simplify right side
    128,456.48x = 14,929,926,916.99
  5. Step 5: Solve for x
    x = 14,929,926,916.99/128,456.48
  6. Step 6: Final answer
    x = 116,225.56

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1.5x scale

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.