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Finding the Fourth Proportional to 781.86, 1,079.55 and 548.58

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Solution

The fourth proportional to 781.86, 1,079.55 and 548.58 is: 757.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.86 : 1,079.55 = 548.58 : x
  2. Step 2: Convert to fraction form
    781.86/1,079.55 = 548.58/x
  3. Step 3: Cross multiply
    781.86x = 1,079.55 × 548.58
  4. Step 4: Simplify right side
    781.86x = 592,219.54
  5. Step 5: Solve for x
    x = 592,219.54/781.86
  6. Step 6: Final answer
    x = 757.45

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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.