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Finding the Fourth Proportional to 734.80, 1,013.99 and 420.07

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Solution

The fourth proportional to 734.80, 1,013.99 and 420.07 is: 579.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.80 : 1,013.99 = 420.07 : x
  2. Step 2: Convert to fraction form
    734.80/1,013.99 = 420.07/x
  3. Step 3: Cross multiply
    734.80x = 1,013.99 × 420.07
  4. Step 4: Simplify right side
    734.80x = 425,946.78
  5. Step 5: Solve for x
    x = 425,946.78/734.80
  6. Step 6: Final answer
    x = 579.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.