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Finding the Fourth Proportional to 256,890.40, 385,335.60 and 172,909.60

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Solution

The fourth proportional to 256,890.40, 385,335.60 and 172,909.60 is: 259,364.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,890.40 : 385,335.60 = 172,909.60 : x
  2. Step 2: Convert to fraction form
    256,890.40/385,335.60 = 172,909.60/x
  3. Step 3: Cross multiply
    256,890.40x = 385,335.60 × 172,909.60
  4. Step 4: Simplify right side
    256,890.40x = 66,628,224,461.76
  5. Step 5: Solve for x
    x = 66,628,224,461.76/256,890.40
  6. Step 6: Final answer
    x = 259,364.40

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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.