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Finding the Fourth Proportional to 390.56, 586.08 and 260.64

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Solution

The fourth proportional to 390.56, 586.08 and 260.64 is: 391.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.56 : 586.08 = 260.64 : x
  2. Step 2: Convert to fraction form
    390.56/586.08 = 260.64/x
  3. Step 3: Cross multiply
    390.56x = 586.08 × 260.64
  4. Step 4: Simplify right side
    390.56x = 152,755.89
  5. Step 5: Solve for x
    x = 152,755.89/390.56
  6. Step 6: Final answer
    x = 391.13

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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.