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Finding the Fourth Proportional to 521.65, 779.00 and 491.28

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Solution

The fourth proportional to 521.65, 779.00 and 491.28 is: 733.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.65 : 779.00 = 491.28 : x
  2. Step 2: Convert to fraction form
    521.65/779.00 = 491.28/x
  3. Step 3: Cross multiply
    521.65x = 779.00 × 491.28
  4. Step 4: Simplify right side
    521.65x = 382,704.51
  5. Step 5: Solve for x
    x = 382,704.51/521.65
  6. Step 6: Final answer
    x = 733.64

Related Problems

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Half scale
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Double scale
Find fourth proportional to 522.65, 780.49 and 492.28
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.