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Finding the Fourth Proportional to 742.86, 1,024.80 and 480.78

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Solution

The fourth proportional to 742.86, 1,024.80 and 480.78 is: 663.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.86 : 1,024.80 = 480.78 : x
  2. Step 2: Convert to fraction form
    742.86/1,024.80 = 480.78/x
  3. Step 3: Cross multiply
    742.86x = 1,024.80 × 480.78
  4. Step 4: Simplify right side
    742.86x = 492,703.34
  5. Step 5: Solve for x
    x = 492,703.34/742.86
  6. Step 6: Final answer
    x = 663.25

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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.