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Finding the Fourth Proportional to 128,143, 176,835.52 and 74,458.23

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Solution

The fourth proportional to 128,143, 176,835.52 and 74,458.23 is: 102,751.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,143 : 176,835.52 = 74,458.23 : x
  2. Step 2: Convert to fraction form
    128,143/176,835.52 = 74,458.23/x
  3. Step 3: Cross multiply
    128,143x = 176,835.52 × 74,458.23
  4. Step 4: Simplify right side
    128,143x = 13,166,859,820.33
  5. Step 5: Solve for x
    x = 13,166,859,820.33/128,143
  6. Step 6: Final answer
    x = 102,751.30

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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.