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Finding the Fourth Proportional to 256,920.40, 385,380.60 and 69,931.60

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Solution

The fourth proportional to 256,920.40, 385,380.60 and 69,931.60 is: 104,897.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,920.40 : 385,380.60 = 69,931.60 : x
  2. Step 2: Convert to fraction form
    256,920.40/385,380.60 = 69,931.60/x
  3. Step 3: Cross multiply
    256,920.40x = 385,380.60 × 69,931.60
  4. Step 4: Simplify right side
    256,920.40x = 26,950,281,966.96
  5. Step 5: Solve for x
    x = 26,950,281,966.96/256,920.40
  6. Step 6: Final answer
    x = 104,897.40

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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.