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Finding the Fourth Proportional to 526.20, 788.90 and 417.66

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Solution

The fourth proportional to 526.20, 788.90 and 417.66 is: 626.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.20 : 788.90 = 417.66 : x
  2. Step 2: Convert to fraction form
    526.20/788.90 = 417.66/x
  3. Step 3: Cross multiply
    526.20x = 788.90 × 417.66
  4. Step 4: Simplify right side
    526.20x = 329,489.89
  5. Step 5: Solve for x
    x = 329,489.89/526.20
  6. Step 6: Final answer
    x = 626.17

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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.