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Finding the Fourth Proportional to 219,012.78, 328,554.66 and 85,820.82

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Solution

The fourth proportional to 219,012.78, 328,554.66 and 85,820.82 is: 128,745.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,012.78 : 328,554.66 = 85,820.82 : x
  2. Step 2: Convert to fraction form
    219,012.78/328,554.66 = 85,820.82/x
  3. Step 3: Cross multiply
    219,012.78x = 328,554.66 × 85,820.82
  4. Step 4: Simplify right side
    219,012.78x = 28,196,830,336.02
  5. Step 5: Solve for x
    x = 28,196,830,336.02/219,012.78
  6. Step 6: Final answer
    x = 128,745.14

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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.