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Finding the Fourth Proportional to 128,283.69, 177,031.76 and 71,695.07

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Solution

The fourth proportional to 128,283.69, 177,031.76 and 71,695.07 is: 98,939.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,283.69 : 177,031.76 = 71,695.07 : x
  2. Step 2: Convert to fraction form
    128,283.69/177,031.76 = 71,695.07/x
  3. Step 3: Cross multiply
    128,283.69x = 177,031.76 × 71,695.07
  4. Step 4: Simplify right side
    128,283.69x = 12,692,304,425.42
  5. Step 5: Solve for x
    x = 12,692,304,425.42/128,283.69
  6. Step 6: Final answer
    x = 98,939.35

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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.