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Finding the Fourth Proportional to 128,605.29, 177,484.65 and 77,630.42

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Solution

The fourth proportional to 128,605.29, 177,484.65 and 77,630.42 is: 107,135.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.29 : 177,484.65 = 77,630.42 : x
  2. Step 2: Convert to fraction form
    128,605.29/177,484.65 = 77,630.42/x
  3. Step 3: Cross multiply
    128,605.29x = 177,484.65 × 77,630.42
  4. Step 4: Simplify right side
    128,605.29x = 13,778,207,923.05
  5. Step 5: Solve for x
    x = 13,778,207,923.05/128,605.29
  6. Step 6: Final answer
    x = 107,135.62

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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.