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Finding the Fourth Proportional to 1,106.76, 1,527.40 and 641

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Solution

The fourth proportional to 1,106.76, 1,527.40 and 641 is: 884.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.76 : 1,527.40 = 641 : x
  2. Step 2: Convert to fraction form
    1,106.76/1,527.40 = 641/x
  3. Step 3: Cross multiply
    1,106.76x = 1,527.40 × 641
  4. Step 4: Simplify right side
    1,106.76x = 979,063.40
  5. Step 5: Solve for x
    x = 979,063.40/1,106.76
  6. Step 6: Final answer
    x = 884.62

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Find fourth proportional to 553.38, 763.70 and 320.50
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Double scale
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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.