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Finding the Fourth Proportional to 128,491.57, 177,315.55 and 70,348.18

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Solution

The fourth proportional to 128,491.57, 177,315.55 and 70,348.18 is: 97,078.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.57 : 177,315.55 = 70,348.18 : x
  2. Step 2: Convert to fraction form
    128,491.57/177,315.55 = 70,348.18/x
  3. Step 3: Cross multiply
    128,491.57x = 177,315.55 × 70,348.18
  4. Step 4: Simplify right side
    128,491.57x = 12,473,825,609.04
  5. Step 5: Solve for x
    x = 12,473,825,609.04/128,491.57
  6. Step 6: Final answer
    x = 97,078.94

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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.