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Finding the Fourth Proportional to 128,731.68, 177,613.72 and 101,423

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Solution

The fourth proportional to 128,731.68, 177,613.72 and 101,423 is: 139,935.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,731.68 : 177,613.72 = 101,423 : x
  2. Step 2: Convert to fraction form
    128,731.68/177,613.72 = 101,423/x
  3. Step 3: Cross multiply
    128,731.68x = 177,613.72 × 101,423
  4. Step 4: Simplify right side
    128,731.68x = 18,014,116,323.56
  5. Step 5: Solve for x
    x = 18,014,116,323.56/128,731.68
  6. Step 6: Final answer
    x = 139,935.38

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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.