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Finding the Fourth Proportional to 456,420.60, 684,728.10 and 140,909.40

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Solution

The fourth proportional to 456,420.60, 684,728.10 and 140,909.40 is: 211,394.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    456,420.60 : 684,728.10 = 140,909.40 : x
  2. Step 2: Convert to fraction form
    456,420.60/684,728.10 = 140,909.40/x
  3. Step 3: Cross multiply
    456,420.60x = 684,728.10 × 140,909.40
  4. Step 4: Simplify right side
    456,420.60x = 96,484,625,734.14
  5. Step 5: Solve for x
    x = 96,484,625,734.14/456,420.60
  6. Step 6: Final answer
    x = 211,394.11

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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.