Home / 143,987.60-215,981.40-91,434.80

Finding the Fourth Proportional to 143,987.60, 215,981.40 and 91,434.80

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Solution

The fourth proportional to 143,987.60, 215,981.40 and 91,434.80 is: 137,152.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,987.60 : 215,981.40 = 91,434.80 : x
  2. Step 2: Convert to fraction form
    143,987.60/215,981.40 = 91,434.80/x
  3. Step 3: Cross multiply
    143,987.60x = 215,981.40 × 91,434.80
  4. Step 4: Simplify right side
    143,987.60x = 19,748,216,112.72
  5. Step 5: Solve for x
    x = 19,748,216,112.72/143,987.60
  6. Step 6: Final answer
    x = 137,152.20

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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.