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Finding the Fourth Proportional to 946.76, 1,303.20 and 821.92

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Solution

The fourth proportional to 946.76, 1,303.20 and 821.92 is: 1,131.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.76 : 1,303.20 = 821.92 : x
  2. Step 2: Convert to fraction form
    946.76/1,303.20 = 821.92/x
  3. Step 3: Cross multiply
    946.76x = 1,303.20 × 821.92
  4. Step 4: Simplify right side
    946.76x = 1,071,126.14
  5. Step 5: Solve for x
    x = 1,071,126.14/946.76
  6. Step 6: Final answer
    x = 1,131.36

Related Problems

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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.