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Finding the Fourth Proportional to 218,741.32, 328,139.34 and 85,604.38

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Solution

The fourth proportional to 218,741.32, 328,139.34 and 85,604.38 is: 128,417.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,741.32 : 328,139.34 = 85,604.38 : x
  2. Step 2: Convert to fraction form
    218,741.32/328,139.34 = 85,604.38/x
  3. Step 3: Cross multiply
    218,741.32x = 328,139.34 × 85,604.38
  4. Step 4: Simplify right side
    218,741.32x = 28,090,164,754.31
  5. Step 5: Solve for x
    x = 28,090,164,754.31/218,741.32
  6. Step 6: Final answer
    x = 128,417.28

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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.