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Finding the Fourth Proportional to 128,578.78, 177,437.55 and 71,991.10

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Solution

The fourth proportional to 128,578.78, 177,437.55 and 71,991.10 is: 99,347.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.78 : 177,437.55 = 71,991.10 : x
  2. Step 2: Convert to fraction form
    128,578.78/177,437.55 = 71,991.10/x
  3. Step 3: Cross multiply
    128,578.78x = 177,437.55 × 71,991.10
  4. Step 4: Simplify right side
    128,578.78x = 12,773,924,405.81
  5. Step 5: Solve for x
    x = 12,773,924,405.81/128,578.78
  6. Step 6: Final answer
    x = 99,347.06

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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.