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Finding the Fourth Proportional to 1,039.42, 1,559.12 and 309.01

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Solution

The fourth proportional to 1,039.42, 1,559.12 and 309.01 is: 463.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.42 : 1,559.12 = 309.01 : x
  2. Step 2: Convert to fraction form
    1,039.42/1,559.12 = 309.01/x
  3. Step 3: Cross multiply
    1,039.42x = 1,559.12 × 309.01
  4. Step 4: Simplify right side
    1,039.42x = 481,783.67
  5. Step 5: Solve for x
    x = 481,783.67/1,039.42
  6. Step 6: Final answer
    x = 463.51

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Double scale
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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.