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Finding the Fourth Proportional to 256,975.60, 385,463.40 and 90,780.40

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Solution

The fourth proportional to 256,975.60, 385,463.40 and 90,780.40 is: 136,170.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,975.60 : 385,463.40 = 90,780.40 : x
  2. Step 2: Convert to fraction form
    256,975.60/385,463.40 = 90,780.40/x
  3. Step 3: Cross multiply
    256,975.60x = 385,463.40 × 90,780.40
  4. Step 4: Simplify right side
    256,975.60x = 34,992,521,637.36
  5. Step 5: Solve for x
    x = 34,992,521,637.36/256,975.60
  6. Step 6: Final answer
    x = 136,170.60

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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.