Home / 145,629.40-218,006.70-86,434.60

Finding the Fourth Proportional to 145,629.40, 218,006.70 and 86,434.60

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Solution

The fourth proportional to 145,629.40, 218,006.70 and 86,434.60 is: 129,392.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,629.40 : 218,006.70 = 86,434.60 : x
  2. Step 2: Convert to fraction form
    145,629.40/218,006.70 = 86,434.60/x
  3. Step 3: Cross multiply
    145,629.40x = 218,006.70 × 86,434.60
  4. Step 4: Simplify right side
    145,629.40x = 18,843,321,911.82
  5. Step 5: Solve for x
    x = 18,843,321,911.82/145,629.40
  6. Step 6: Final answer
    x = 129,392.29

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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.