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Finding the Fourth Proportional to 85,668.94, 128,534.15 and 38,280.07

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Solution

The fourth proportional to 85,668.94, 128,534.15 and 38,280.07 is: 57,433.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,668.94 : 128,534.15 = 38,280.07 : x
  2. Step 2: Convert to fraction form
    85,668.94/128,534.15 = 38,280.07/x
  3. Step 3: Cross multiply
    85,668.94x = 128,534.15 × 38,280.07
  4. Step 4: Simplify right side
    85,668.94x = 4,920,296,259.39
  5. Step 5: Solve for x
    x = 4,920,296,259.39/85,668.94
  6. Step 6: Final answer
    x = 57,433.84

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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.