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Finding the Fourth Proportional to 128,356.88, 177,117.09 and 70,988.42

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Solution

The fourth proportional to 128,356.88, 177,117.09 and 70,988.42 is: 97,955.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,356.88 : 177,117.09 = 70,988.42 : x
  2. Step 2: Convert to fraction form
    128,356.88/177,117.09 = 70,988.42/x
  3. Step 3: Cross multiply
    128,356.88x = 177,117.09 × 70,988.42
  4. Step 4: Simplify right side
    128,356.88x = 12,573,262,374.10
  5. Step 5: Solve for x
    x = 12,573,262,374.10/128,356.88
  6. Step 6: Final answer
    x = 97,955.50

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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.