Home / 128,556.13-177,386.34-80,775.64

Finding the Fourth Proportional to 128,556.13, 177,386.34 and 80,775.64

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Solution

The fourth proportional to 128,556.13, 177,386.34 and 80,775.64 is: 111,457.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,556.13 : 177,386.34 = 80,775.64 : x
  2. Step 2: Convert to fraction form
    128,556.13/177,386.34 = 80,775.64/x
  3. Step 3: Cross multiply
    128,556.13x = 177,386.34 × 80,775.64
  4. Step 4: Simplify right side
    128,556.13x = 14,328,495,140.76
  5. Step 5: Solve for x
    x = 14,328,495,140.76/128,556.13
  6. Step 6: Final answer
    x = 111,457.11

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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.