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Finding the Fourth Proportional to 128,047.74, 176,705.91 and 71,457.90

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Solution

The fourth proportional to 128,047.74, 176,705.91 and 71,457.90 is: 98,611.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,047.74 : 176,705.91 = 71,457.90 : x
  2. Step 2: Convert to fraction form
    128,047.74/176,705.91 = 71,457.90/x
  3. Step 3: Cross multiply
    128,047.74x = 176,705.91 × 71,457.90
  4. Step 4: Simplify right side
    128,047.74x = 12,627,033,246.19
  5. Step 5: Solve for x
    x = 12,627,033,246.19/128,047.74
  6. Step 6: Final answer
    x = 98,611.92

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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.