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Finding the Fourth Proportional to 256,438.90, 384,658.35 and 79,000.30

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Solution

The fourth proportional to 256,438.90, 384,658.35 and 79,000.30 is: 118,500.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,438.90 : 384,658.35 = 79,000.30 : x
  2. Step 2: Convert to fraction form
    256,438.90/384,658.35 = 79,000.30/x
  3. Step 3: Cross multiply
    256,438.90x = 384,658.35 × 79,000.30
  4. Step 4: Simplify right side
    256,438.90x = 30,388,125,047.51
  5. Step 5: Solve for x
    x = 30,388,125,047.51/256,438.90
  6. Step 6: Final answer
    x = 118,500.45

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Similar ratio
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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.