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Finding the Fourth Proportional to 943.70, 1,415.43 and 259.70

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Solution

The fourth proportional to 943.70, 1,415.43 and 259.70 is: 389.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.70 : 1,415.43 = 259.70 : x
  2. Step 2: Convert to fraction form
    943.70/1,415.43 = 259.70/x
  3. Step 3: Cross multiply
    943.70x = 1,415.43 × 259.70
  4. Step 4: Simplify right side
    943.70x = 367,587.17
  5. Step 5: Solve for x
    x = 367,587.17/943.70
  6. Step 6: Final answer
    x = 389.52

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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.