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Finding the Fourth Proportional to 318,756.60, 478,152.18 and 119,129.40

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Solution

The fourth proportional to 318,756.60, 478,152.18 and 119,129.40 is: 178,700.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,756.60 : 478,152.18 = 119,129.40 : x
  2. Step 2: Convert to fraction form
    318,756.60/478,152.18 = 119,129.40/x
  3. Step 3: Cross multiply
    318,756.60x = 478,152.18 × 119,129.40
  4. Step 4: Simplify right side
    318,756.60x = 56,961,982,312.09
  5. Step 5: Solve for x
    x = 56,961,982,312.09/318,756.60
  6. Step 6: Final answer
    x = 178,700.56

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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.