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Finding the Fourth Proportional to 128,290.50, 177,041.16 and 85,950.18

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Solution

The fourth proportional to 128,290.50, 177,041.16 and 85,950.18 is: 118,611.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,290.50 : 177,041.16 = 85,950.18 : x
  2. Step 2: Convert to fraction form
    128,290.50/177,041.16 = 85,950.18/x
  3. Step 3: Cross multiply
    128,290.50x = 177,041.16 × 85,950.18
  4. Step 4: Simplify right side
    128,290.50x = 15,216,719,569.41
  5. Step 5: Solve for x
    x = 15,216,719,569.41/128,290.50
  6. Step 6: Final answer
    x = 118,611.43

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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.