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Finding the Fourth Proportional to 208,688.80, 312,802.80 and 115,261.60

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Solution

The fourth proportional to 208,688.80, 312,802.80 and 115,261.60 is: 172,765.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,688.80 : 312,802.80 = 115,261.60 : x
  2. Step 2: Convert to fraction form
    208,688.80/312,802.80 = 115,261.60/x
  3. Step 3: Cross multiply
    208,688.80x = 312,802.80 × 115,261.60
  4. Step 4: Simplify right side
    208,688.80x = 36,054,151,212.48
  5. Step 5: Solve for x
    x = 36,054,151,212.48/208,688.80
  6. Step 6: Final answer
    x = 172,765.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.