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Finding the Fourth Proportional to 128,287.35, 177,045.21 and 74,572.20

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Solution

The fourth proportional to 128,287.35, 177,045.21 and 74,572.20 is: 102,914.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,287.35 : 177,045.21 = 74,572.20 : x
  2. Step 2: Convert to fraction form
    128,287.35/177,045.21 = 74,572.20/x
  3. Step 3: Cross multiply
    128,287.35x = 177,045.21 × 74,572.20
  4. Step 4: Simplify right side
    128,287.35x = 13,202,650,809.16
  5. Step 5: Solve for x
    x = 13,202,650,809.16/128,287.35
  6. Step 6: Final answer
    x = 102,914.67

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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.