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Finding the Fourth Proportional to 128,009.52, 176,684.76 and 77,750.64

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Solution

The fourth proportional to 128,009.52, 176,684.76 and 77,750.64 is: 107,315.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,009.52 : 176,684.76 = 77,750.64 : x
  2. Step 2: Convert to fraction form
    128,009.52/176,684.76 = 77,750.64/x
  3. Step 3: Cross multiply
    128,009.52x = 176,684.76 × 77,750.64
  4. Step 4: Simplify right side
    128,009.52x = 13,737,353,168.25
  5. Step 5: Solve for x
    x = 13,737,353,168.25/128,009.52
  6. Step 6: Final answer
    x = 107,315.09

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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.