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Finding the Fourth Proportional to 128,218.43, 176,948.21 and 77,247.21

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Solution

The fourth proportional to 128,218.43, 176,948.21 and 77,247.21 is: 106,605.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,218.43 : 176,948.21 = 77,247.21 : x
  2. Step 2: Convert to fraction form
    128,218.43/176,948.21 = 77,247.21/x
  3. Step 3: Cross multiply
    128,218.43x = 176,948.21 × 77,247.21
  4. Step 4: Simplify right side
    128,218.43x = 13,668,755,536.99
  5. Step 5: Solve for x
    x = 13,668,755,536.99/128,218.43
  6. Step 6: Final answer
    x = 106,605.23

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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.