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Finding the Fourth Proportional to 802.70, 1,106.43 and 644.75

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Solution

The fourth proportional to 802.70, 1,106.43 and 644.75 is: 888.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.70 : 1,106.43 = 644.75 : x
  2. Step 2: Convert to fraction form
    802.70/1,106.43 = 644.75/x
  3. Step 3: Cross multiply
    802.70x = 1,106.43 × 644.75
  4. Step 4: Simplify right side
    802.70x = 713,370.74
  5. Step 5: Solve for x
    x = 713,370.74/802.70
  6. Step 6: Final answer
    x = 888.71

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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.