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Finding the Fourth Proportional to 243,669.20, 365,503.80 and 85,913.60

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Solution

The fourth proportional to 243,669.20, 365,503.80 and 85,913.60 is: 128,870.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,669.20 : 365,503.80 = 85,913.60 : x
  2. Step 2: Convert to fraction form
    243,669.20/365,503.80 = 85,913.60/x
  3. Step 3: Cross multiply
    243,669.20x = 365,503.80 × 85,913.60
  4. Step 4: Simplify right side
    243,669.20x = 31,401,747,271.68
  5. Step 5: Solve for x
    x = 31,401,747,271.68/243,669.20
  6. Step 6: Final answer
    x = 128,870.40

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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.