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Finding the Fourth Proportional to 128,220.97, 176,935.67 and 70,859.60

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Solution

The fourth proportional to 128,220.97, 176,935.67 and 70,859.60 is: 97,781.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,220.97 : 176,935.67 = 70,859.60 : x
  2. Step 2: Convert to fraction form
    128,220.97/176,935.67 = 70,859.60/x
  3. Step 3: Cross multiply
    128,220.97x = 176,935.67 × 70,859.60
  4. Step 4: Simplify right side
    128,220.97x = 12,537,590,889.97
  5. Step 5: Solve for x
    x = 12,537,590,889.97/128,220.97
  6. Step 6: Final answer
    x = 97,781.13

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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.