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Finding the Fourth Proportional to 720.07, 992.64 and 509.56

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Solution

The fourth proportional to 720.07, 992.64 and 509.56 is: 702.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.07 : 992.64 = 509.56 : x
  2. Step 2: Convert to fraction form
    720.07/992.64 = 509.56/x
  3. Step 3: Cross multiply
    720.07x = 992.64 × 509.56
  4. Step 4: Simplify right side
    720.07x = 505,809.64
  5. Step 5: Solve for x
    x = 505,809.64/720.07
  6. Step 6: Final answer
    x = 702.45

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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.