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Finding the Fourth Proportional to 20,646.90, 30,951.72 and 7,490.07

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Solution

The fourth proportional to 20,646.90, 30,951.72 and 7,490.07 is: 11,228.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.90 : 30,951.72 = 7,490.07 : x
  2. Step 2: Convert to fraction form
    20,646.90/30,951.72 = 7,490.07/x
  3. Step 3: Cross multiply
    20,646.90x = 30,951.72 × 7,490.07
  4. Step 4: Simplify right side
    20,646.90x = 231,830,549.42
  5. Step 5: Solve for x
    x = 231,830,549.42/20,646.90
  6. Step 6: Final answer
    x = 11,228.35

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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.