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Finding the Fourth Proportional to 243,605.20, 365,399.30 and 85,830.16

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Solution

The fourth proportional to 243,605.20, 365,399.30 and 85,830.16 is: 128,742.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,605.20 : 365,399.30 = 85,830.16 : x
  2. Step 2: Convert to fraction form
    243,605.20/365,399.30 = 85,830.16/x
  3. Step 3: Cross multiply
    243,605.20x = 365,399.30 × 85,830.16
  4. Step 4: Simplify right side
    243,605.20x = 31,362,280,382.89
  5. Step 5: Solve for x
    x = 31,362,280,382.89/243,605.20
  6. Step 6: Final answer
    x = 128,742.25

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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.