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Finding the Fourth Proportional to 100,920.96, 151,907.76 and 85,699.44

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Solution

The fourth proportional to 100,920.96, 151,907.76 and 85,699.44 is: 128,996.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,920.96 : 151,907.76 = 85,699.44 : x
  2. Step 2: Convert to fraction form
    100,920.96/151,907.76 = 85,699.44/x
  3. Step 3: Cross multiply
    100,920.96x = 151,907.76 × 85,699.44
  4. Step 4: Simplify right side
    100,920.96x = 13,018,409,963.65
  5. Step 5: Solve for x
    x = 13,018,409,963.65/100,920.96
  6. Step 6: Final answer
    x = 128,996.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.