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Finding the Fourth Proportional to 128,611.70, 177,484.10 and 71,254.74

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Solution

The fourth proportional to 128,611.70, 177,484.10 and 71,254.74 is: 98,331.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.70 : 177,484.10 = 71,254.74 : x
  2. Step 2: Convert to fraction form
    128,611.70/177,484.10 = 71,254.74/x
  3. Step 3: Cross multiply
    128,611.70x = 177,484.10 × 71,254.74
  4. Step 4: Simplify right side
    128,611.70x = 12,646,583,399.63
  5. Step 5: Solve for x
    x = 12,646,583,399.63/128,611.70
  6. Step 6: Final answer
    x = 98,331.52

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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.