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Finding the Fourth Proportional to 128,802.87, 177,748.02 and 71,440.20

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Solution

The fourth proportional to 128,802.87, 177,748.02 and 71,440.20 is: 98,587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,802.87 : 177,748.02 = 71,440.20 : x
  2. Step 2: Convert to fraction form
    128,802.87/177,748.02 = 71,440.20/x
  3. Step 3: Cross multiply
    128,802.87x = 177,748.02 × 71,440.20
  4. Step 4: Simplify right side
    128,802.87x = 12,698,354,098.40
  5. Step 5: Solve for x
    x = 12,698,354,098.40/128,802.87
  6. Step 6: Final answer
    x = 98,587.51

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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.