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Finding the Fourth Proportional to 653.16, 978.94 and 405.98

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Solution

The fourth proportional to 653.16, 978.94 and 405.98 is: 608.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.16 : 978.94 = 405.98 : x
  2. Step 2: Convert to fraction form
    653.16/978.94 = 405.98/x
  3. Step 3: Cross multiply
    653.16x = 978.94 × 405.98
  4. Step 4: Simplify right side
    653.16x = 397,430.06
  5. Step 5: Solve for x
    x = 397,430.06/653.16
  6. Step 6: Final answer
    x = 608.47

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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.