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Finding the Fourth Proportional to 169,680.30, 254,447.55 and 85,407.90

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Solution

The fourth proportional to 169,680.30, 254,447.55 and 85,407.90 is: 128,075.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,680.30 : 254,447.55 = 85,407.90 : x
  2. Step 2: Convert to fraction form
    169,680.30/254,447.55 = 85,407.90/x
  3. Step 3: Cross multiply
    169,680.30x = 254,447.55 × 85,407.90
  4. Step 4: Simplify right side
    169,680.30x = 21,731,830,905.65
  5. Step 5: Solve for x
    x = 21,731,830,905.65/169,680.30
  6. Step 6: Final answer
    x = 128,075.16

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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.