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Finding the Fourth Proportional to 19,612.20, 29,409.08 and 7,123.40

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Solution

The fourth proportional to 19,612.20, 29,409.08 and 7,123.40 is: 10,681.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,612.20 : 29,409.08 = 7,123.40 : x
  2. Step 2: Convert to fraction form
    19,612.20/29,409.08 = 7,123.40/x
  3. Step 3: Cross multiply
    19,612.20x = 29,409.08 × 7,123.40
  4. Step 4: Simplify right side
    19,612.20x = 209,492,640.47
  5. Step 5: Solve for x
    x = 209,492,640.47/19,612.20
  6. Step 6: Final answer
    x = 10,681.75

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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.