Home / 128,445.12-177,249.42-71,856.45

Finding the Fourth Proportional to 128,445.12, 177,249.42 and 71,856.45

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Solution

The fourth proportional to 128,445.12, 177,249.42 and 71,856.45 is: 99,159.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,445.12 : 177,249.42 = 71,856.45 : x
  2. Step 2: Convert to fraction form
    128,445.12/177,249.42 = 71,856.45/x
  3. Step 3: Cross multiply
    128,445.12x = 177,249.42 × 71,856.45
  4. Step 4: Simplify right side
    128,445.12x = 12,736,514,085.76
  5. Step 5: Solve for x
    x = 12,736,514,085.76/128,445.12
  6. Step 6: Final answer
    x = 99,159.19

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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.