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Finding the Fourth Proportional to 128,666.76, 177,560.01 and 72,078.54

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Solution

The fourth proportional to 128,666.76, 177,560.01 and 72,078.54 is: 99,468.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,666.76 : 177,560.01 = 72,078.54 : x
  2. Step 2: Convert to fraction form
    128,666.76/177,560.01 = 72,078.54/x
  3. Step 3: Cross multiply
    128,666.76x = 177,560.01 × 72,078.54
  4. Step 4: Simplify right side
    128,666.76x = 12,798,266,283.19
  5. Step 5: Solve for x
    x = 12,798,266,283.19/128,666.76
  6. Step 6: Final answer
    x = 99,468.32

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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.