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Finding the Fourth Proportional to 128,988.81, 177,994.80 and 72,389.25

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Solution

The fourth proportional to 128,988.81, 177,994.80 and 72,389.25 is: 99,891.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.81 : 177,994.80 = 72,389.25 : x
  2. Step 2: Convert to fraction form
    128,988.81/177,994.80 = 72,389.25/x
  3. Step 3: Cross multiply
    128,988.81x = 177,994.80 × 72,389.25
  4. Step 4: Simplify right side
    128,988.81x = 12,884,910,075.90
  5. Step 5: Solve for x
    x = 12,884,910,075.90/128,988.81
  6. Step 6: Final answer
    x = 99,891.69

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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.