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Finding the Fourth Proportional to 100,986.10, 151,479.15 and 85,434.10

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Solution

The fourth proportional to 100,986.10, 151,479.15 and 85,434.10 is: 128,151.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,986.10 : 151,479.15 = 85,434.10 : x
  2. Step 2: Convert to fraction form
    100,986.10/151,479.15 = 85,434.10/x
  3. Step 3: Cross multiply
    100,986.10x = 151,479.15 × 85,434.10
  4. Step 4: Simplify right side
    100,986.10x = 12,941,484,849.02
  5. Step 5: Solve for x
    x = 12,941,484,849.02/100,986.10
  6. Step 6: Final answer
    x = 128,151.15

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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.