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Finding the Fourth Proportional to 128,301, 177,058.58 and 71,721.80

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Solution

The fourth proportional to 128,301, 177,058.58 and 71,721.80 is: 98,977.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,301 : 177,058.58 = 71,721.80 : x
  2. Step 2: Convert to fraction form
    128,301/177,058.58 = 71,721.80/x
  3. Step 3: Cross multiply
    128,301x = 177,058.58 × 71,721.80
  4. Step 4: Simplify right side
    128,301x = 12,698,960,063.04
  5. Step 5: Solve for x
    x = 12,698,960,063.04/128,301
  6. Step 6: Final answer
    x = 98,977.87

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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.