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Finding the Fourth Proportional to 528.61, 788.58 and 491.32

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Solution

The fourth proportional to 528.61, 788.58 and 491.32 is: 732.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.61 : 788.58 = 491.32 : x
  2. Step 2: Convert to fraction form
    528.61/788.58 = 491.32/x
  3. Step 3: Cross multiply
    528.61x = 788.58 × 491.32
  4. Step 4: Simplify right side
    528.61x = 387,445.13
  5. Step 5: Solve for x
    x = 387,445.13/528.61
  6. Step 6: Final answer
    x = 732.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.