Home / 318,901.20-478,409.40-131,931.60

Finding the Fourth Proportional to 318,901.20, 478,409.40 and 131,931.60

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Solution

The fourth proportional to 318,901.20, 478,409.40 and 131,931.60 is: 197,921.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,901.20 : 478,409.40 = 131,931.60 : x
  2. Step 2: Convert to fraction form
    318,901.20/478,409.40 = 131,931.60/x
  3. Step 3: Cross multiply
    318,901.20x = 478,409.40 × 131,931.60
  4. Step 4: Simplify right side
    318,901.20x = 63,117,317,597.04
  5. Step 5: Solve for x
    x = 63,117,317,597.04/318,901.20
  6. Step 6: Final answer
    x = 197,921.23

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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.