Home / 128,579.16-177,435.18-71,220.36

Finding the Fourth Proportional to 128,579.16, 177,435.18 and 71,220.36

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Solution

The fourth proportional to 128,579.16, 177,435.18 and 71,220.36 is: 98,281.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,579.16 : 177,435.18 = 71,220.36 : x
  2. Step 2: Convert to fraction form
    128,579.16/177,435.18 = 71,220.36/x
  3. Step 3: Cross multiply
    128,579.16x = 177,435.18 × 71,220.36
  4. Step 4: Simplify right side
    128,579.16x = 12,636,997,396.26
  5. Step 5: Solve for x
    x = 12,636,997,396.26/128,579.16
  6. Step 6: Final answer
    x = 98,281.85

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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.