Home / 128,439.50-177,242.49-71,075.36

Finding the Fourth Proportional to 128,439.50, 177,242.49 and 71,075.36

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Solution

The fourth proportional to 128,439.50, 177,242.49 and 71,075.36 is: 98,081.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,439.50 : 177,242.49 = 71,075.36 : x
  2. Step 2: Convert to fraction form
    128,439.50/177,242.49 = 71,075.36/x
  3. Step 3: Cross multiply
    128,439.50x = 177,242.49 × 71,075.36
  4. Step 4: Simplify right side
    128,439.50x = 12,597,572,897.83
  5. Step 5: Solve for x
    x = 12,597,572,897.83/128,439.50
  6. Step 6: Final answer
    x = 98,081.77

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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.