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Finding the Fourth Proportional to 398,353.55, 550,427.22 and 318,440.57

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Solution

The fourth proportional to 398,353.55, 550,427.22 and 318,440.57 is: 440,007.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,353.55 : 550,427.22 = 318,440.57 : x
  2. Step 2: Convert to fraction form
    398,353.55/550,427.22 = 318,440.57/x
  3. Step 3: Cross multiply
    398,353.55x = 550,427.22 × 318,440.57
  4. Step 4: Simplify right side
    398,353.55x = 175,278,356,088.11
  5. Step 5: Solve for x
    x = 175,278,356,088.11/398,353.55
  6. Step 6: Final answer
    x = 440,007.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.