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Finding the Fourth Proportional to 920.46, 1,270.21 and 500.81

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Solution

The fourth proportional to 920.46, 1,270.21 and 500.81 is: 691.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.46 : 1,270.21 = 500.81 : x
  2. Step 2: Convert to fraction form
    920.46/1,270.21 = 500.81/x
  3. Step 3: Cross multiply
    920.46x = 1,270.21 × 500.81
  4. Step 4: Simplify right side
    920.46x = 636,125.02
  5. Step 5: Solve for x
    x = 636,125.02/920.46
  6. Step 6: Final answer
    x = 691.10

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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.