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Finding the Fourth Proportional to 522.64, 781.60 and 390.96

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Solution

The fourth proportional to 522.64, 781.60 and 390.96 is: 584.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.64 : 781.60 = 390.96 : x
  2. Step 2: Convert to fraction form
    522.64/781.60 = 390.96/x
  3. Step 3: Cross multiply
    522.64x = 781.60 × 390.96
  4. Step 4: Simplify right side
    522.64x = 305,574.34
  5. Step 5: Solve for x
    x = 305,574.34/522.64
  6. Step 6: Final answer
    x = 584.67

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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.