Home / 128,572.30-177,427.83-71,985.70

Finding the Fourth Proportional to 128,572.30, 177,427.83 and 71,985.70

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Solution

The fourth proportional to 128,572.30, 177,427.83 and 71,985.70 is: 99,339.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,572.30 : 177,427.83 = 71,985.70 : x
  2. Step 2: Convert to fraction form
    128,572.30/177,427.83 = 71,985.70/x
  3. Step 3: Cross multiply
    128,572.30x = 177,427.83 × 71,985.70
  4. Step 4: Simplify right side
    128,572.30x = 12,772,266,542.03
  5. Step 5: Solve for x
    x = 12,772,266,542.03/128,572.30
  6. Step 6: Final answer
    x = 99,339.18

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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.