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Finding the Fourth Proportional to 943.52, 1,415.20 and 430.56

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Solution

The fourth proportional to 943.52, 1,415.20 and 430.56 is: 645.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.52 : 1,415.20 = 430.56 : x
  2. Step 2: Convert to fraction form
    943.52/1,415.20 = 430.56/x
  3. Step 3: Cross multiply
    943.52x = 1,415.20 × 430.56
  4. Step 4: Simplify right side
    943.52x = 609,328.51
  5. Step 5: Solve for x
    x = 609,328.51/943.52
  6. Step 6: Final answer
    x = 645.80

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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.