Home / 141,987.20-212,721.60-86,518.40

Finding the Fourth Proportional to 141,987.20, 212,721.60 and 86,518.40

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Solution

The fourth proportional to 141,987.20, 212,721.60 and 86,518.40 is: 129,619.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,987.20 : 212,721.60 = 86,518.40 : x
  2. Step 2: Convert to fraction form
    141,987.20/212,721.60 = 86,518.40/x
  3. Step 3: Cross multiply
    141,987.20x = 212,721.60 × 86,518.40
  4. Step 4: Simplify right side
    141,987.20x = 18,404,332,477.44
  5. Step 5: Solve for x
    x = 18,404,332,477.44/141,987.20
  6. Step 6: Final answer
    x = 129,619.66

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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.