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Finding the Fourth Proportional to 428,783.30, 642,714.15 and 162,440.90

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Solution

The fourth proportional to 428,783.30, 642,714.15 and 162,440.90 is: 243,486.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,783.30 : 642,714.15 = 162,440.90 : x
  2. Step 2: Convert to fraction form
    428,783.30/642,714.15 = 162,440.90/x
  3. Step 3: Cross multiply
    428,783.30x = 642,714.15 × 162,440.90
  4. Step 4: Simplify right side
    428,783.30x = 104,403,064,968.74
  5. Step 5: Solve for x
    x = 104,403,064,968.74/428,783.30
  6. Step 6: Final answer
    x = 243,486.78

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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.