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Finding the Fourth Proportional to 128,925.84, 177,925.50 and 85,830.96

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Solution

The fourth proportional to 128,925.84, 177,925.50 and 85,830.96 is: 118,451.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,925.84 : 177,925.50 = 85,830.96 : x
  2. Step 2: Convert to fraction form
    128,925.84/177,925.50 = 85,830.96/x
  3. Step 3: Cross multiply
    128,925.84x = 177,925.50 × 85,830.96
  4. Step 4: Simplify right side
    128,925.84x = 15,271,516,473.48
  5. Step 5: Solve for x
    x = 15,271,516,473.48/128,925.84
  6. Step 6: Final answer
    x = 118,451.94

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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.