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Finding the Fourth Proportional to 843.40, 1,264.02 and 457.84

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Solution

The fourth proportional to 843.40, 1,264.02 and 457.84 is: 686.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.40 : 1,264.02 = 457.84 : x
  2. Step 2: Convert to fraction form
    843.40/1,264.02 = 457.84/x
  3. Step 3: Cross multiply
    843.40x = 1,264.02 × 457.84
  4. Step 4: Simplify right side
    843.40x = 578,718.92
  5. Step 5: Solve for x
    x = 578,718.92/843.40
  6. Step 6: Final answer
    x = 686.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.