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Finding the Fourth Proportional to 128,088.80, 191,888.40 and 68,904.80

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Solution

The fourth proportional to 128,088.80, 191,888.40 and 68,904.80 is: 103,225.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,088.80 : 191,888.40 = 68,904.80 : x
  2. Step 2: Convert to fraction form
    128,088.80/191,888.40 = 68,904.80/x
  3. Step 3: Cross multiply
    128,088.80x = 191,888.40 × 68,904.80
  4. Step 4: Simplify right side
    128,088.80x = 13,222,031,824.32
  5. Step 5: Solve for x
    x = 13,222,031,824.32/128,088.80
  6. Step 6: Final answer
    x = 103,225.51

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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.