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Finding the Fourth Proportional to 522.19, 720.18 and 322.78

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Solution

The fourth proportional to 522.19, 720.18 and 322.78 is: 445.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.19 : 720.18 = 322.78 : x
  2. Step 2: Convert to fraction form
    522.19/720.18 = 322.78/x
  3. Step 3: Cross multiply
    522.19x = 720.18 × 322.78
  4. Step 4: Simplify right side
    522.19x = 232,459.70
  5. Step 5: Solve for x
    x = 232,459.70/522.19
  6. Step 6: Final answer
    x = 445.16

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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.