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Finding the Fourth Proportional to 128,085.51, 176,795.54 and 74,394.66

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Solution

The fourth proportional to 128,085.51, 176,795.54 and 74,394.66 is: 102,686.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,085.51 : 176,795.54 = 74,394.66 : x
  2. Step 2: Convert to fraction form
    128,085.51/176,795.54 = 74,394.66/x
  3. Step 3: Cross multiply
    128,085.51x = 176,795.54 × 74,394.66
  4. Step 4: Simplify right side
    128,085.51x = 13,152,644,087.82
  5. Step 5: Solve for x
    x = 13,152,644,087.82/128,085.51
  6. Step 6: Final answer
    x = 102,686.43

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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.