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Finding the Fourth Proportional to 1,129.04, 1,693.88 and 398.64

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Solution

The fourth proportional to 1,129.04, 1,693.88 and 398.64 is: 598.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.04 : 1,693.88 = 398.64 : x
  2. Step 2: Convert to fraction form
    1,129.04/1,693.88 = 398.64/x
  3. Step 3: Cross multiply
    1,129.04x = 1,693.88 × 398.64
  4. Step 4: Simplify right side
    1,129.04x = 675,248.32
  5. Step 5: Solve for x
    x = 675,248.32/1,129.04
  6. Step 6: Final answer
    x = 598.07

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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.