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Finding the Fourth Proportional to 218,868.51, 328,450.50 and 85,732.26

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Solution

The fourth proportional to 218,868.51, 328,450.50 and 85,732.26 is: 128,656.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,868.51 : 328,450.50 = 85,732.26 : x
  2. Step 2: Convert to fraction form
    218,868.51/328,450.50 = 85,732.26/x
  3. Step 3: Cross multiply
    218,868.51x = 328,450.50 × 85,732.26
  4. Step 4: Simplify right side
    218,868.51x = 28,158,803,663.13
  5. Step 5: Solve for x
    x = 28,158,803,663.13/218,868.51
  6. Step 6: Final answer
    x = 128,656.26

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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.