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Finding the Fourth Proportional to 256,938.40, 385,407.60 and 163,511.20

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Solution

The fourth proportional to 256,938.40, 385,407.60 and 163,511.20 is: 245,266.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,938.40 : 385,407.60 = 163,511.20 : x
  2. Step 2: Convert to fraction form
    256,938.40/385,407.60 = 163,511.20/x
  3. Step 3: Cross multiply
    256,938.40x = 385,407.60 × 163,511.20
  4. Step 4: Simplify right side
    256,938.40x = 63,018,459,165.12
  5. Step 5: Solve for x
    x = 63,018,459,165.12/256,938.40
  6. Step 6: Final answer
    x = 245,266.80

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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.