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Finding the Fourth Proportional to 128,472.80, 177,249.40 and 74,746.31

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Solution

The fourth proportional to 128,472.80, 177,249.40 and 74,746.31 is: 103,124.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,472.80 : 177,249.40 = 74,746.31 : x
  2. Step 2: Convert to fraction form
    128,472.80/177,249.40 = 74,746.31/x
  3. Step 3: Cross multiply
    128,472.80x = 177,249.40 × 74,746.31
  4. Step 4: Simplify right side
    128,472.80x = 13,248,737,526.60
  5. Step 5: Solve for x
    x = 13,248,737,526.60/128,472.80
  6. Step 6: Final answer
    x = 103,124.85

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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.