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Finding the Fourth Proportional to 612.90, 840.39 and 598.32

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Solution

The fourth proportional to 612.90, 840.39 and 598.32 is: 820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.90 : 840.39 = 598.32 : x
  2. Step 2: Convert to fraction form
    612.90/840.39 = 598.32/x
  3. Step 3: Cross multiply
    612.90x = 840.39 × 598.32
  4. Step 4: Simplify right side
    612.90x = 502,822.14
  5. Step 5: Solve for x
    x = 502,822.14/612.90
  6. Step 6: Final answer
    x = 820.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.