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Finding the Fourth Proportional to 128,209.19, 176,939.34 and 70,859.71

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Solution

The fourth proportional to 128,209.19, 176,939.34 and 70,859.71 is: 97,792.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,209.19 : 176,939.34 = 70,859.71 : x
  2. Step 2: Convert to fraction form
    128,209.19/176,939.34 = 70,859.71/x
  3. Step 3: Cross multiply
    128,209.19x = 176,939.34 × 70,859.71
  4. Step 4: Simplify right side
    128,209.19x = 12,537,870,275.44
  5. Step 5: Solve for x
    x = 12,537,870,275.44/128,209.19
  6. Step 6: Final answer
    x = 97,792.29

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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.