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Finding the Fourth Proportional to 128,491.07, 177,314.85 and 70,347.68

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Solution

The fourth proportional to 128,491.07, 177,314.85 and 70,347.68 is: 97,078.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.07 : 177,314.85 = 70,347.68 : x
  2. Step 2: Convert to fraction form
    128,491.07/177,314.85 = 70,347.68/x
  3. Step 3: Cross multiply
    128,491.07x = 177,314.85 × 70,347.68
  4. Step 4: Simplify right side
    128,491.07x = 12,473,688,327.05
  5. Step 5: Solve for x
    x = 12,473,688,327.05/128,491.07
  6. Step 6: Final answer
    x = 97,078.25

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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.