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Finding the Fourth Proportional to 112,416.80, 168,916.80 and 99,586.40

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Solution

The fourth proportional to 112,416.80, 168,916.80 and 99,586.40 is: 149,637.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,416.80 : 168,916.80 = 99,586.40 : x
  2. Step 2: Convert to fraction form
    112,416.80/168,916.80 = 99,586.40/x
  3. Step 3: Cross multiply
    112,416.80x = 168,916.80 × 99,586.40
  4. Step 4: Simplify right side
    112,416.80x = 16,821,816,011.52
  5. Step 5: Solve for x
    x = 16,821,816,011.52/112,416.80
  6. Step 6: Final answer
    x = 149,637.92

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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.