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Finding the Fourth Proportional to 740.25, 1,021.55 and 478.31

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Solution

The fourth proportional to 740.25, 1,021.55 and 478.31 is: 660.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.25 : 1,021.55 = 478.31 : x
  2. Step 2: Convert to fraction form
    740.25/1,021.55 = 478.31/x
  3. Step 3: Cross multiply
    740.25x = 1,021.55 × 478.31
  4. Step 4: Simplify right side
    740.25x = 488,610.08
  5. Step 5: Solve for x
    x = 488,610.08/740.25
  6. Step 6: Final answer
    x = 660.06

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1.5x scale

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.