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Finding the Fourth Proportional to 256,940.90, 385,521.61 and 99,280.07

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Solution

The fourth proportional to 256,940.90, 385,521.61 and 99,280.07 is: 148,962.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,940.90 : 385,521.61 = 99,280.07 : x
  2. Step 2: Convert to fraction form
    256,940.90/385,521.61 = 99,280.07/x
  3. Step 3: Cross multiply
    256,940.90x = 385,521.61 × 99,280.07
  4. Step 4: Simplify right side
    256,940.90x = 38,274,612,427.31
  5. Step 5: Solve for x
    x = 38,274,612,427.31/256,940.90
  6. Step 6: Final answer
    x = 148,962.71

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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.