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Finding the Fourth Proportional to 128,754.61, 177,678.29 and 71,393.65

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Solution

The fourth proportional to 128,754.61, 177,678.29 and 71,393.65 is: 98,521.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,754.61 : 177,678.29 = 71,393.65 : x
  2. Step 2: Convert to fraction form
    128,754.61/177,678.29 = 71,393.65/x
  3. Step 3: Cross multiply
    128,754.61x = 177,678.29 × 71,393.65
  4. Step 4: Simplify right side
    128,754.61x = 12,685,101,291.89
  5. Step 5: Solve for x
    x = 12,685,101,291.89/128,754.61
  6. Step 6: Final answer
    x = 98,521.53

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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.