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Finding the Fourth Proportional to 128,218.73, 176,948.62 and 77,247.51

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Solution

The fourth proportional to 128,218.73, 176,948.62 and 77,247.51 is: 106,605.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,218.73 : 176,948.62 = 77,247.51 : x
  2. Step 2: Convert to fraction form
    128,218.73/176,948.62 = 77,247.51/x
  3. Step 3: Cross multiply
    128,218.73x = 176,948.62 × 77,247.51
  4. Step 4: Simplify right side
    128,218.73x = 13,668,839,408.19
  5. Step 5: Solve for x
    x = 13,668,839,408.19/128,218.73
  6. Step 6: Final answer
    x = 106,605.64

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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.