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Finding the Fourth Proportional to 720.18, 993.69 and 458.58

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Solution

The fourth proportional to 720.18, 993.69 and 458.58 is: 632.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.18 : 993.69 = 458.58 : x
  2. Step 2: Convert to fraction form
    720.18/993.69 = 458.58/x
  3. Step 3: Cross multiply
    720.18x = 993.69 × 458.58
  4. Step 4: Simplify right side
    720.18x = 455,686.36
  5. Step 5: Solve for x
    x = 455,686.36/720.18
  6. Step 6: Final answer
    x = 632.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.