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Finding the Fourth Proportional to 128,393.12, 177,126.78 and 77,376.86

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Solution

The fourth proportional to 128,393.12, 177,126.78 and 77,376.86 is: 106,746.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,393.12 : 177,126.78 = 77,376.86 : x
  2. Step 2: Convert to fraction form
    128,393.12/177,126.78 = 77,376.86/x
  3. Step 3: Cross multiply
    128,393.12x = 177,126.78 × 77,376.86
  4. Step 4: Simplify right side
    128,393.12x = 13,705,514,058.31
  5. Step 5: Solve for x
    x = 13,705,514,058.31/128,393.12
  6. Step 6: Final answer
    x = 106,746.48

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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.