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Finding the Fourth Proportional to 866.80, 1,300.61 and 434.26

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Solution

The fourth proportional to 866.80, 1,300.61 and 434.26 is: 651.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.80 : 1,300.61 = 434.26 : x
  2. Step 2: Convert to fraction form
    866.80/1,300.61 = 434.26/x
  3. Step 3: Cross multiply
    866.80x = 1,300.61 × 434.26
  4. Step 4: Simplify right side
    866.80x = 564,802.90
  5. Step 5: Solve for x
    x = 564,802.90/866.80
  6. Step 6: Final answer
    x = 651.60

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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.