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Finding the Fourth Proportional to 128,018.90, 176,697.70 and 77,760.02

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Solution

The fourth proportional to 128,018.90, 176,697.70 and 77,760.02 is: 107,328.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,018.90 : 176,697.70 = 77,760.02 : x
  2. Step 2: Convert to fraction form
    128,018.90/176,697.70 = 77,760.02/x
  3. Step 3: Cross multiply
    128,018.90x = 176,697.70 × 77,760.02
  4. Step 4: Simplify right side
    128,018.90x = 13,740,015,608.07
  5. Step 5: Solve for x
    x = 13,740,015,608.07/128,018.90
  6. Step 6: Final answer
    x = 107,328.03

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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.