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Finding the Fourth Proportional to 783.48, 1,081.50 and 521.84

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Solution

The fourth proportional to 783.48, 1,081.50 and 521.84 is: 720.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.48 : 1,081.50 = 521.84 : x
  2. Step 2: Convert to fraction form
    783.48/1,081.50 = 521.84/x
  3. Step 3: Cross multiply
    783.48x = 1,081.50 × 521.84
  4. Step 4: Simplify right side
    783.48x = 564,369.96
  5. Step 5: Solve for x
    x = 564,369.96/783.48
  6. Step 6: Final answer
    x = 720.34

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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.