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Finding the Fourth Proportional to 105,579.42, 145,644.36 and 65,280.30

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Solution

The fourth proportional to 105,579.42, 145,644.36 and 65,280.30 is: 90,052.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,579.42 : 145,644.36 = 65,280.30 : x
  2. Step 2: Convert to fraction form
    105,579.42/145,644.36 = 65,280.30/x
  3. Step 3: Cross multiply
    105,579.42x = 145,644.36 × 65,280.30
  4. Step 4: Simplify right side
    105,579.42x = 9,507,707,514.11
  5. Step 5: Solve for x
    x = 9,507,707,514.11/105,579.42
  6. Step 6: Final answer
    x = 90,052.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.