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Finding the Fourth Proportional to 103,543.70, 155,315.55 and 66,218.90

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Solution

The fourth proportional to 103,543.70, 155,315.55 and 66,218.90 is: 99,328.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,543.70 : 155,315.55 = 66,218.90 : x
  2. Step 2: Convert to fraction form
    103,543.70/155,315.55 = 66,218.90/x
  3. Step 3: Cross multiply
    103,543.70x = 155,315.55 × 66,218.90
  4. Step 4: Simplify right side
    103,543.70x = 10,284,824,873.90
  5. Step 5: Solve for x
    x = 10,284,824,873.90/103,543.70
  6. Step 6: Final answer
    x = 99,328.35

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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.