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Finding the Fourth Proportional to 643.40, 962.70 and 585.80

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Solution

The fourth proportional to 643.40, 962.70 and 585.80 is: 876.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.40 : 962.70 = 585.80 : x
  2. Step 2: Convert to fraction form
    643.40/962.70 = 585.80/x
  3. Step 3: Cross multiply
    643.40x = 962.70 × 585.80
  4. Step 4: Simplify right side
    643.40x = 563,949.66
  5. Step 5: Solve for x
    x = 563,949.66/643.40
  6. Step 6: Final answer
    x = 876.51

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1.5x scale

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.