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Finding the Fourth Proportional to 128,638.40, 191,400.59 and 125,424.32

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Solution

The fourth proportional to 128,638.40, 191,400.59 and 125,424.32 is: 186,618.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.40 : 191,400.59 = 125,424.32 : x
  2. Step 2: Convert to fraction form
    128,638.40/191,400.59 = 125,424.32/x
  3. Step 3: Cross multiply
    128,638.40x = 191,400.59 × 125,424.32
  4. Step 4: Simplify right side
    128,638.40x = 24,006,288,204.91
  5. Step 5: Solve for x
    x = 24,006,288,204.91/128,638.40
  6. Step 6: Final answer
    x = 186,618.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.