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Finding the Fourth Proportional to 103,999.10, 155,998.65 and 99,916.70

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Solution

The fourth proportional to 103,999.10, 155,998.65 and 99,916.70 is: 149,875.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,999.10 : 155,998.65 = 99,916.70 : x
  2. Step 2: Convert to fraction form
    103,999.10/155,998.65 = 99,916.70/x
  3. Step 3: Cross multiply
    103,999.10x = 155,998.65 × 99,916.70
  4. Step 4: Simplify right side
    103,999.10x = 15,586,870,312.46
  5. Step 5: Solve for x
    x = 15,586,870,312.46/103,999.10
  6. Step 6: Final answer
    x = 149,875.05

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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.