Home / 128,880.10-193,320.15-86,780.35

Finding the Fourth Proportional to 128,880.10, 193,320.15 and 86,780.35

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Solution

The fourth proportional to 128,880.10, 193,320.15 and 86,780.35 is: 130,170.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,880.10 : 193,320.15 = 86,780.35 : x
  2. Step 2: Convert to fraction form
    128,880.10/193,320.15 = 86,780.35/x
  3. Step 3: Cross multiply
    128,880.10x = 193,320.15 × 86,780.35
  4. Step 4: Simplify right side
    128,880.10x = 16,776,390,279.05
  5. Step 5: Solve for x
    x = 16,776,390,279.05/128,880.10
  6. Step 6: Final answer
    x = 130,170.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.